This test crashes from time to time with:

[ RUN      ] NavigationAccessibilityTest.TestNavigateToNewUrl
...
[13572:2000:1204/233200.699:WARNING:embedded_test_server.cc(228)] Request not handled. Returning 404: /favicon.ico
[13572:8920:1204/233200.703:FATAL:navigation_accessibility_uitest_win.cc(126)] Check failed: S_OK == AccessibleObjectFromEvent( event_info.hwnd, event_info.obj_id, event_info.child_id, acc_obj.GetAddressOf(), child_variant.Receive()). 
Backtrace:
	base::debug::StackTrace::StackTrace [0x024800A0+32]
	base::debug::StackTrace::StackTrace [0x0245EF7D+13]
	logging::LogMessage::~LogMessage [0x0240EA2E+78]
	WinAccessibilityEventMonitor::WaitForNextEvent [0x00C005D9+223]
	NavigationAccessibilityTest_TestNavigateToNewUrl_Test::RunTestOnMainThread [0x00C00A7A+394]
	content::BrowserTestBase::ProxyRunTestOnMainThreadLoop [0x01EEEFAF+239]
	ChromeBrowserMainParts::PreMainMessageLoopRunImpl [0x0262FF57+3493]
	ChromeBrowserMainParts::PreMainMessageLoopRun [0x0262F0F6+150]
	content::BrowserMainLoop::PreMainMessageLoopRun [0x011E76A2+66]
	content::StartupTaskRunner::RunAllTasksNow [0x0145505F+23]
	content::BrowserMainLoop::CreateStartupTasks [0x011E6223+479]
	content::BrowserMainRunnerImpl::Initialize [0x011E9E3B+507]
	content::BrowserMain [0x011E4BE8+136]
	content::RunNamedProcessTypeMain [0x01E88F5F+123]
	content::ContentMainRunnerImpl::Run [0x01E89402+146]
	service_manager::Main [0x02EA3100+620]
	content::ContentMain [0x01E88E8D+49]
	content::BrowserTestBase::SetUp [0x01EEEDFE+1342]
	InProcessBrowserTest::SetUp [0x01E93792+274]
	testing::Test::Run [0x00C95471+103]
	testing::TestInfo::Run [0x00C95B4B+201]
	testing::TestCase::Run [0x00C95ED9+235]
	testing::internal::UnitTestImpl::RunAllTests [0x00C99C63+595]
	testing::UnitTest::Run [0x00C99939+151]
	base::TestSuite::Run [0x023F2628+100]
	InteractiveUITestSuiteRunner::RunTestSuite [0x00C13769+57]
	content::LaunchTests [0x01EEBB6E+326]
	LaunchChromeTests [0x01E90833+143]
	main [0x00C1370B+75]
	__scrt_common_main_seh [0x04FEAABA+248] (f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:283)
	BaseThreadInitThunk [0x76AD338A+18]
	RtlInitializeExceptionChain [0x779A9F72+99]
	RtlInitializeExceptionChain [0x779A9F45+54]

[199/373] NavigationAccessibilityTest.TestNavigateToNewUrl (CRASHED)

See https://chromium-swarm.appspot.com/task?id=3a3e605044627310&refresh=10&show_raw=1 for one such case.

Tentatively assigning to a random ui/accessability/OWNER for triage and assignment.