It timed-out in https://uberchromegw.corp.google.com/i/internal.client.kitchensync/builders/Mac%20Dev/builds/15560, but was green in https://uberchromegw.corp.google.com/i/internal.client.kitchensync/builders/Mac%20Dev/builds/15561 and https://uberchromegw.corp.google.com/i/internal.client.kitchensync/builders/Mac%20Dev/builds/15559.

The log:
=====
[7266:771:0123/201749.341915:VERBOSE1:login_ui_test_utils.cc(296)] Wait for login UI to be ready.
objc[7280]: Class RTCDispatcher is implemented in both /bot/w/ir/out/Debug/./libcontent.dylib and /bot/w/ir/out/Debug/libchrome_dll.dylib. One of the two will be used. Which one is undefined.
[7266:771:0123/201750.379715:VERBOSE1:login_ui_test_utils.cc(298)] Sign in user: cs.ks.mac@gmail.com
[7266:771:0123/201750.844894:WARNING:CONSOLE(2411)] "Unrecognized message from GAIA: showConfirmCancel", source: chrome://chrome-signin/gaia_auth_host.js (2411)
[7266:771:0123/201751.852049:WARNING:CONSOLE(2411)] "Unrecognized message from GAIA: clearOldAttempts", source: chrome://chrome-signin/gaia_auth_host.js (2411)
[7266:771:0123/201753.332806:INFO:CONSOLE(0)] "[DOM] Found 2 elements with non-unique id #ca: (More info: https://goo.gl/9p2vKq) %o %o", source: https://accounts.google.com/signin/v2/challenge/pwd?client_id=77185425430.apps.googleusercontent.com&hl=en-US&source=chrome&flow=signin&flowName=EmbeddedSetupChromeUsermenu&TL=AHnYQLyij75CAmwFYuHANoHuaImODi5NOgtwROV2xWk39-rPn6HN3zTaiQ_afx46cSuelAuB0WLO3ZOHeveL-dQ58wuow73dJHpmjt7NRL0PF4nSxvR61Kn8g-DhFNawk_m_Hkf6J33elMEyLlzf08xjyeoXAGdLiQ&cid=1&navigationDirection=forward (0)
[7266:771:0123/201753.559513:WARNING:CONSOLE(2411)] "Unrecognized message from GAIA: showConfirmCancel", source: chrome://chrome-signin/gaia_auth_host.js (2411)
[7266:771:0123/201755.145996:VERBOSE1:login_ui_test_utils.cc(76)] Google signin succeeded.
[7266:142091:0123/201755.153571:WARNING:syncer_proto_util.cc(338)] Error posting from syncer: Response Code (bogus on error): -1 Content-Length (bogus on error): -1 Server Status: SYNC_AUTH_ERROR
objc[7281]: Class RTCDispatcher is implemented in both /bot/w/ir/out/Debug/./libcontent.dylib and /bot/w/ir/out/Debug/libchrome_dll.dylib. One of the two will be used. Which one is undefined.
objc[7282]: Class RTCDispatcher is implemented in both /bot/w/ir/out/Debug/./libcontent.dylib and /bot/w/ir/out/Debug/libchrome_dll.dylib. One of the two will be used. Which one is undefined.
[7266:771:0123/201802.833187:INFO:CONSOLE(1)] "Uncaught ReferenceError: inline is not defined", source:  (1)
[7266:771:0123/201802.984575:WARNING:CONSOLE(0)] "Styling master document from stylesheets defined in HTML Imports is deprecated, and is planned to be removed in M65, around March 2018. Please refer to https://goo.gl/EGXzpw for possible migration paths.", source:  (0)
[7266:771:0123/201804.190394:ERROR:CONSOLE(1)] "Uncaught ReferenceError: inline is not defined", source: chrome://sync-confirmation/ (1)
objc[7283]: Class RTCDispatcher is implemented in both /bot/w/ir/out/Debug/./libcontent.dylib and /bot/w/ir/out/Debug/libchrome_dll.dylib. One of the two will be used. Which one is undefined.
[7266:142091:0123/201804.612344:WARNING:sync_encryption_handler_impl.cc(346)] Ignoring new implicit passphrase. Keystore migration already performed.
[7279:771:0123/201805.167833:ERROR:render_process_impl.cc(213)] WebFrame LEAKED 2 TIMES
objc[7284]: Class RTCDispatcher is implemented in both /bot/w/ir/out/Debug/./libcontent.dylib and /bot/w/ir/out/Debug/libchrome_dll.dylib. One of the two will be used. Which one is undefined.
[7266:98307:0123/201806.678787:WARNING:shared_model_type_processor.cc(504)] Received remote delete for a non-existing item. client_tag_hash: Ib9bkQ6C8INZYmhBKXKjLsJTPy4=
BrowserTestBase received signal: Terminated: 15. Backtrace:
0   libbase.dylib                       0x0000000125e9548e base::debug::StackTrace::StackTrace(unsigned long) + 174
1   libbase.dylib                       0x0000000125e9554d base::debug::StackTrace::StackTrace(unsigned long) + 29
2   libbase.dylib                       0x0000000125e939cc base::debug::StackTrace::StackTrace() + 28
3   sync_integration_tests              0x000000011870ed6e content::(anonymous namespace)::DumpStackTraceSignalHandler(int) + 622
4   libsystem_platform.dylib            0x00007fff8f6105aa _sigtramp + 26
5   ???                                 0x00007f8322d2a398 0x0 + 140201201673112
6   CoreFoundation                      0x00007fff91c3bf15 __CFRunLoopServiceMachPort + 181
7   CoreFoundation                      0x00007fff91c3b539 __CFRunLoopRun + 1161
8   CoreFoundation                      0x00007fff91c3ae75 CFRunLoopRunSpecific + 309
9   HIToolbox                           0x00007fff8ad9fa0d RunCurrentEventLoopInMode + 226
10  HIToolbox                           0x00007fff8ad9f7b7 ReceiveNextEventCommon + 479
11  HIToolbox                           0x00007fff8ad9f5bc _BlockUntilNextEventMatchingListInModeWithFilter + 65
12  AppKit                              0x00007fff884dd24e _DPSNextEvent + 1434
13  AppKit                              0x00007fff884dc89b -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 122
14  sync_integration_tests              0x00000001120a3e7a __71-[BrowserCrApplication nextEventMatchingMask:untilDate:inMode:dequeue:]_block_invoke + 106
15  libbase.dylib                       0x0000000125f31f5a base::mac::CallWithEHFrame(void () block_pointer) + 10
16  sync_integration_tests              0x00000001120a3d18 -[BrowserCrApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 248
17  AppKit                              0x00007fff884d099c -[NSApplication run] + 553
18  libbase.dylib                       0x0000000125f91472 base::MessagePumpNSApplication::DoRun(base::MessagePump::Delegate*) + 354
19  libbase.dylib                       0x0000000125f8e2f4 base::MessagePumpCFRunLoopBase::Run(base::MessagePump::Delegate*) + 116
20  libbase.dylib                       0x0000000125f80793 base::MessageLoop::Run(bool) + 579
21  libbase.dylib                       0x00000001260819d1 base::RunLoop::Run() + 593
22  sync_integration_tests              0x00000001115eca4f StatusChangeChecker::StartBlockingWait() + 399
23  sync_integration_tests              0x00000001115ec84b StatusChangeChecker::Wait() + 619
24  sync_integration_tests              0x000000010ee2d7d1 TwoClientTypedUrlsSyncTest_AddThenDelete_E2ETest_Test::RunTestOnMainThread() + 2433
25  sync_integration_tests              0x000000011870e7eb content::BrowserTestBase::ProxyRunTestOnMainThreadLoop() + 491
26  sync_integration_tests              0x0000000118710d5d void base::internal::FunctorTraits<void (content::BrowserTestBase::*)(), void>::Invoke<content::BrowserTestBase*>(void (content::BrowserTestBase::*)(), content::BrowserTestBase*&&) + 125
27  sync_integration_tests              0x0000000118710ca4 void base::internal::InvokeHelper<false, void>::MakeItSo<void (content::BrowserTestBase::* const&)(), content::BrowserTestBase*>(void (content::BrowserTestBase::* const&&&)(), content::BrowserTestBase*&&) + 68
28  sync_integration_tests              0x0000000118710c33 void base::internal::Invoker<base::internal::BindState<void (content::BrowserTestBase::*)(), base::internal::UnretainedWrapper<content::BrowserTestBase> >, void ()>::RunImpl<void (content::BrowserTestBase::* const&)(), std::__1::tuple<base::internal::UnretainedWrapper<content::BrowserTestBase> > const&, 0ul>(void (content::BrowserTestBase::* const&&&)(), std::__1::tuple<base::internal::UnretainedWrapper<content::BrowserTestBase> > const&&&, std::__1::integer_sequence<unsigned long, 0ul>) + 99
29  sync_integration_tests              0x0000000118710b6c base::internal::Invoker<base::internal::BindState<void (content::BrowserTestBase::*)(), base::internal::UnretainedWrapper<content::BrowserTestBase> >, void ()>::Run(base::internal::BindStateBase*) + 44
30  sync_integration_tests              0x000000010f08254d base::RepeatingCallback<void ()>::Run() const & + 61
31  sync_integration_tests              0x00000001120b0997 ChromeBrowserMainParts::PreMainMessageLoopRunImpl() + 8391
32  sync_integration_tests              0x00000001120ae81d ChromeBrowserMainParts::PreMainMessageLoopRun() + 253
33  libcontent.dylib                    0x000000012d640481 content::BrowserMainLoop::PreMainMessageLoopRun() + 337
34  libcontent.dylib                    0x000000012d647a5d int base::internal::FunctorTraits<int (content::BrowserMainLoop::*)(), void>::Invoke<content::BrowserMainLoop*>(int (content::BrowserMainLoop::*)(), content::BrowserMainLoop*&&) + 125
35  libcontent.dylib                    0x000000012d6479a4 int base::internal::InvokeHelper<false, int>::MakeItSo<int (content::BrowserMainLoop::* const&)(), content::BrowserMainLoop*>(int (content::BrowserMainLoop::* const&&&)(), content::BrowserMainLoop*&&) + 68
36  libcontent.dylib                    0x000000012d647933 int base::internal::Invoker<base::internal::BindState<int (content::BrowserMainLoop::*)(), base::internal::UnretainedWrapper<content::BrowserMainLoop> >, int ()>::RunImpl<int (content::BrowserMainLoop::* const&)(), std::__1::tuple<base::internal::UnretainedWrapper<content::BrowserMainLoop> > const&, 0ul>(int (content::BrowserMainLoop::* const&&&)(), std::__1::tuple<base::internal::UnretainedWrapper<content::BrowserMainLoop> > const&&&, std::__1::integer_sequence<unsigned long, 0ul>) + 99
37  libcontent.dylib                    0x000000012d64783c base::internal::Invoker<base::internal::BindState<int (content::BrowserMainLoop::*)(), base::internal::UnretainedWrapper<content::BrowserMainLoop> >, int ()>::Run(base::internal::BindStateBase*) + 44
38  libcontent.dylib                    0x000000012ea2e47d base::RepeatingCallback<int ()>::Run() const & + 61
39  libcontent.dylib                    0x000000012ea2e350 content::StartupTaskRunner::RunAllTasksNow() + 528
40  libcontent.dylib                    0x000000012d63b324 content::BrowserMainLoop::CreateStartupTasks() + 2260
41  libcontent.dylib                    0x000000012d64b106 content::BrowserMainRunnerImpl::Initialize(content::MainFunctionParams const&) + 2198
42  libcontent.dylib                    0x000000012d632d9a content::BrowserMain(content::MainFunctionParams const&) + 554
43  libcontent.dylib                    0x0000000130271bdb content::RunNamedProcessTypeMain(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, content::MainFunctionParams const&, content::ContentMainDelegate*) + 603
44  libcontent.dylib                    0x0000000130273456 content::ContentMainRunnerImpl::Run() + 1334
45  libcontent.dylib                    0x000000013026a0f5 content::ContentServiceManagerMainDelegate::RunEmbedderProcess() + 53
46  libembedder.dylib                   0x000000013db2a450 service_manager::Main(service_manager::MainParams const&) + 2128
47  libcontent.dylib                    0x000000013027193c content::ContentMain(content::ContentMainParams const&) + 92
48  sync_integration_tests              0x000000011870e281 content::BrowserTestBase::SetUp() + 8097
49  sync_integration_tests              0x000000011163c634 InProcessBrowserTest::SetUp() + 1972
50  sync_integration_tests              0x000000011160d4a7 SyncTest::SetUp() + 4007
51  sync_integration_tests              0x000000010eecff3e void testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) + 126
52  sync_integration_tests              0x000000010eea91f2 void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) + 114
53  sync_integration_tests              0x000000010eea90d4 testing::Test::Run() + 116
54  sync_integration_tests              0x000000010eeaa20d testing::TestInfo::Run() + 221
55  sync_integration_tests              0x000000010eeab5dc testing::TestCase::Run() + 236
56  sync_integration_tests              0x000000010eeb930a testing::internal::UnitTestImpl::RunAllTests() + 970
57  sync_integration_tests              0x000000010eed3e7e bool testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) + 126
58  sync_integration_tests              0x000000010eeb8ec2 bool testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) + 114
59  sync_integration_tests              0x000000010eeb8d9d testing::UnitTest::Run() + 397
60  sync_integration_tests              0x0000000111ddcd51 RUN_ALL_TESTS() + 17
61  sync_integration_tests              0x0000000111ddc0a0 base::TestSuite::Run() + 352
[65/66] TwoClientTypedUrlsSyncTest.AddThenDelete_E2ETest (TIMED OUT)
=====

The relevant bit is
=====
22  sync_integration_tests              0x00000001115eca4f StatusChangeChecker::StartBlockingWait() + 399
23  sync_integration_tests              0x00000001115ec84b StatusChangeChecker::Wait() + 619
24  sync_integration_tests              0x000000010ee2d7d1 TwoClientTypedUrlsSyncTest_AddThenDelete_E2ETest_Test::RunTestOnMainThread() + 2433
2
=====


This reminds  issue 801568  and issue 801521.