CrExtensionsToolbarTest.ClickHandlers is the second most failing browser tests on Linux bots very frequently timing out.

[ RUN      ] CrExtensionsToolbarTest.ClickHandlers
Xlib:  extension "RANDR" missing on display ":99".
[15097:15097:0908/090227.654003:ERROR:browser_dm_token_storage_linux.cc(93)] Error: /etc/machine-id contains 32 characters (32 were expected).
[15097:15235:0908/090227.763699:ERROR:bus.cc(394)] Failed to connect to the bus: Could not parse server address: Unknown address type (examples of valid types are "tcp" and on UNIX "unix")
[15097:15097:0908/090227.770547:WARNING:password_store_factory.cc(261)] Using basic (unencrypted) store for password storage. See https://chromium.googlesource.com/chromium/src/+/master/docs/linux_password_storage.md for more information about password storage options.

(browser_tests:15097): LIBDBUSMENU-GLIB-WARNING **: Unable to get session bus: Unknown or unsupported transport 'disabled' for address 'disabled:'
[15217:15217:0908/090228.120528:WARNING:ipc_message_attachment_set.cc(49)] MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[15097:15097:0908/090228.128327:WARNING:CONSOLE(0)] "HTML Imports is deprecated and will be removed in M73, around March 2019. Please use ES modules instead. See https://www.chromestatus.com/features/5144752345317376 for more details.", source:  (0)
[15097:15097:0908/090228.153218:WARNING:CONSOLE(442)] "document.registerElement is deprecated and will be removed in M73, around March 2019. Please use window.customElements.define instead. See https://www.chromestatus.com/features/4642138092470272 for more details.", source: chrome://resources/polymer/v1_0/polymer/polymer-micro-extracted.js (442)
[15097:15097:0908/090228.250240:WARNING:CONSOLE(2083)] "Element.createShadowRoot is deprecated and will be removed in M73, around March 2019. Please use Element.attachShadow instead. See https://www.chromestatus.com/features/4507242028072960 for more details.", source: chrome://resources/polymer/v1_0/polymer/polymer-mini-extracted.js (2083)
[15097:15097:0908/090228.315221:INFO:CONSOLE(1236)] "Running TestCase CrExtensionsToolbarTest.ClickHandlers", source: file:///b/s/w/ir/chrome/test/data/webui/test_api.js (1236)
BrowserTestBase received signal: Terminated. Backtrace:
#0 0x00000527603c base::debug::StackTrace::StackTrace()
#1 0x00000570f405 content::(anonymous namespace)::DumpStackTraceSignalHandler()
#2 0x7f55cee4ecb0 <unknown>
#3 0x7f55cef08c9d __poll
#4 0x7f55d45c7fe4 <unknown>
#5 0x7f55d45c80ec g_main_context_iteration
#6 0x0000051f5982 base::MessagePumpGlib::Run()
#7 0x0000052127c5 base::RunLoop::Run()
#8 0x00000573223f content::RunThisRunLoop()
#9 0x00000988be59 WebUITestHandler::WaitForResult()
#10 0x00000988bb15 WebUITestHandler::RunJavaScriptTestWithResult()
#11 0x0000052b16ed WebUIBrowserTest::RunJavascriptUsingHandler()
#12 0x0000052b1b97 WebUIBrowserTest::RunJavascriptTestF()
#13 0x0000033e9bd6 CrExtensionsToolbarTest_ClickHandlers_Test::RunTestOnMainThread()
#14 0x00000570e7c8 content::BrowserTestBase::ProxyRunTestOnMainThreadLoop()
#15 0x0000052ff1b9 ChromeBrowserMainParts::PreMainMessageLoopRunImpl()
#16 0x0000052fde61 ChromeBrowserMainParts::PreMainMessageLoopRun()
#17 0x000003ff1d11 content::BrowserMainLoop::PreMainMessageLoopRun()
#18 0x000004372d67 content::StartupTaskRunner::RunAllTasksNow()
#19 0x000003ff037d content::BrowserMainLoop::CreateStartupTasks()
#20 0x000003ff4653 content::BrowserMainRunnerImpl::Initialize()
#21 0x000003fee214 content::BrowserMain()
#22 0x000005159b4b content::ContentMainRunnerImpl::Run()
#23 0x000006d866ab service_manager::Main()
#24 0x000005157ea1 content::ContentMain()
#25 0x00000570e3b7 content::BrowserTestBase::SetUp()
#26 0x0000052ab8a6 InProcessBrowserTest::SetUp()
#27 0x0000035688bd testing::Test::Run()
#28 0x000003569520 testing::TestInfo::Run()
#29 0x000003569a37 testing::TestCase::Run()
#30 0x000003575c97 testing::internal::UnitTestImpl::RunAllTests()
#31 0x00000357580d testing::UnitTest::Run()
#32 0x0000052bf721 base::TestSuite::Run()
#33 0x0000051d019a ChromeTestSuiteRunner::RunTestSuite()
#34 0x00000572ecc4 content::LaunchTests()
#35 0x0000051d0635 LaunchChromeTests()
#36 0x0000051d011e main
#37 0x7f55cee39f45 __libc_start_main
#38 0x00000207c02a _start
[816/1056] CrExtensionsToolbarTest.ClickHandlers (TIMED OUT)