Started since https://chromium-review.googlesource.com/c/chromium/src/+/1218186

All tests introduced in that CL are failing.

Failures look like :

[ RUN      ] HostedAppOpaqueBrowserFrameViewTest.LightThemeColor
[15497:13831:0918/031904.601203:WARNING:notification_platform_bridge_mac.mm(510)] AlertNotificationService: XPC connection invalidated.
2018-09-18 03:19:04.699 browser_tests[15497:1393037] *** Owner supplied to -[NSTrackingArea initWithRect:options:owner:userInfo:] referenced a deallocating object. Tracking area behavior is undefined. Break on NSTrackingAreaDeallocatingOwnerError to debug.
[15497:775:0918/031904.758361:ERROR:delegated_frame_host.cc(174)] Not implemented reached in void content::DelegatedFrameHost::SetNeedsBeginFrames(bool)
2018-09-18 03:19:05.223 browser_tests[15497:1393037] *** WARNING: Textured window <FramedBrowserWindow: 0x7facc97c7360> is getting an implicitly transparent titlebar. This will break when linking against newer SDKs. Use NSWindow's -titlebarAppearsTransparent=YES instead.
2018-09-18 03:19:05.252 browser_tests[15497:1393037] *** Owner supplied to -[NSTrackingArea initWithRect:options:owner:userInfo:] referenced a deallocating object. Tracking area behavior is undefined. Break on NSTrackingAreaDeallocatingOwnerError to debug.
[15497:775:0918/031905.306046:ERROR:delegated_frame_host.cc(174)] Not implemented reached in void content::DelegatedFrameHost::SetNeedsBeginFrames(bool)
BrowserTestBase received signal: Segmentation fault: 11. Backtrace:
0   browser_tests                       0x0000000106c42f1c base::debug::StackTrace::StackTrace(unsigned long) + 28
1   browser_tests                       0x000000010723f695 content::(anonymous namespace)::DumpStackTraceSignalHandler(int) + 229
2   libsystem_platform.dylib            0x00007fff5d5c3f5a _sigtramp + 26
3   ???                                 0x00007facc9460958 0x0 + 140380087912792
4   browser_tests                       0x00000001045e9f9b HostedAppOpaqueBrowserFrameViewTest_LightThemeColor_Test::RunTestOnMainThread() + 27
5   browser_tests                       0x000000010723eb4b content::BrowserTestBase::ProxyRunTestOnMainThreadLoop() + 491
6   browser_tests                       0x0000000106d00d31 ChromeBrowserMainParts::PreMainMessageLoopRunImpl() + 4481
7   browser_tests                       0x0000000106cffaae ChromeBrowserMainParts::PreMainMessageLoopRun() + 62
8   browser_tests                       0x0000000105726a63 content::BrowserMainLoop::PreMainMessageLoopRun() + 67
9   browser_tests                       0x0000000105b40007 content::StartupTaskRunner::RunAllTasksNow() + 39
10  browser_tests                       0x00000001057251b8 content::BrowserMainLoop::CreateStartupTasks() + 712
11  browser_tests                       0x0000000105728f80 content::BrowserMainRunnerImpl::Initialize(content::MainFunctionParams const&) + 96
12  browser_tests                       0x00000001057232b4 content::BrowserMain(content::MainFunctionParams const&) + 180
13  browser_tests                       0x0000000106b1e5f2 content::ContentMainRunnerImpl::Run(bool) + 610
14  browser_tests                       0x0000000108c31891 service_manager::Main(service_manager::MainParams const&) + 2849
15  browser_tests                       0x0000000106b1d7e4 content::ContentMain(content::ContentMainParams const&) + 68
16  browser_tests                       0x000000010723e779 content::BrowserTestBase::SetUp() + 2841
17  browser_tests                       0x0000000106c7c385 InProcessBrowserTest::SetUp() + 517
18  browser_tests                       0x0000000104a64ccd testing::Test::Run() + 109
19  browser_tests                       0x0000000104a65950 testing::TestInfo::Run() + 304
20  browser_tests                       0x0000000104a65ec7 testing::TestCase::Run() + 279
21  browser_tests                       0x0000000104a71e57 testing::internal::UnitTestImpl::RunAllTests() + 871
22  browser_tests                       0x0000000104a71acd testing::UnitTest::Run() + 109
23  browser_tests                       0x0000000106c96ba6 base::TestSuite::Run() + 166
24  browser_tests                       0x0000000106b8021d ChromeTestSuiteRunner::RunTestSuite(int, char**) + 45
25  browser_tests                       0x0000000107261518 content::LaunchTests(content::TestLauncherDelegate*, unsigned long, int, char**) + 552
26  browser_tests                       0x0000000106b8079a LaunchChromeTests(unsigned long, content::TestLauncherDelegate*, int, char**) + 490
27  browser_tests                       0x0000000106b8018e main + 94
28  libdyld.dylib                       0x00007fff5d2b5015 start + 1
29  ???                                 0x000000000000000d 0x0 + 13