See:
https://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%281%29/builds/58148
https://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%281%29/builds/58155

Sample logs:
DevToolsBeforeUnloadTest.TestUndockedDevToolsApplicationClose (run #1):
[ RUN      ] DevToolsBeforeUnloadTest.TestUndockedDevToolsApplicationClose
[1444:5340:0315/185656.336:INFO:media_foundation_video_encode_accelerator_win.cc(329)] Windows versions earlier than 8 are not supported.
[1444:5340:0315/185656.337:INFO:media_foundation_video_encode_accelerator_win.cc(329)] Windows versions earlier than 8 are not supported.
HTTP server started on http://127.0.0.1:58422...
sending server_data: {"host": "127.0.0.1", "port": 58422} (36 bytes)
c:\c\win\src\chrome	estase\ui_test_utils.cc(117): error: Value of: dialog_
  Actual: false
Expected: true
Backtrace:
	DevToolsBeforeUnloadTest::GetDialog [0x0072F335+37]
	DevToolsBeforeUnloadTest::AcceptModalDialog [0x0072DFA1+17]
	DevToolsBeforeUnloadTest::RunBeforeUnloadSanityTest [0x0073088A+282]
	DevToolsBeforeUnloadTest_TestUndockedDevToolsApplicationClose_Test::RunTestOnMainThread [0x0073144C+44]
	InProcessBrowserTest::RunTestOnMainThreadLoop [0x024A9E8D+605]
	content::BrowserTestBase::ProxyRunTestOnMainThreadLoop [0x035721F0+224]
	??$Invoke@PAVBrowserTestBase@content@@$$V@?$FunctorTraits@P8BrowserTestBase@content@@AEXXZX@internal@base@@SAXP8BrowserTestBase@content@@AEXXZ$$QAPAV34@@Z [0x03571582+18]
	base::internal::InvokeHelper<0,void>::MakeItSo<void (__thiscall content::BrowserTestBase::*const &)(void),content::BrowserTestBase *> [0x03571654+36]
	base::internal::Invoker<base::internal::BindState<void (__thiscall content::BrowserTestBase::*)(void),base::internal::UnretainedWrapper<content::BrowserTestBase> >,void __cdecl(void)>::RunImpl<void (__thiscall content::BrowserTestBase::*const &)(void),std [0x0357175B+59]
	base::internal::Invoker<base::internal::BindState<void (__thiscall content::BrowserTestBase::*)(void),base::internal::UnretainedWrapper<content::BrowserTestBase> >,void __cdecl(void)>::Run [0x03572574+36]
	base::internal::RunMixin<base::Callback<void __cdecl(void),1,1> >::Run [0x0061107F+63]
	ChromeBrowserMainParts::PreMainMessageLoopRunImpl [0x030198E7+5575]
	ChromeBrowserMainParts::PreMainMessageLoopRun [0x030182C4+244]
	content::BrowserMainLoop::PreMainMessageLoopRun [0x1195C137+215]
	??$Invoke@PAVBrowserMainLoop@content@@$$V@?$FunctorTraits@P8BrowserMainLoop@content@@AEHXZX@internal@base@@SAHP8BrowserMainLoop@content@@AEHXZ$$QAPAV34@@Z [0x11950212+18]
	base::internal::InvokeHelper<0,int>::MakeItSo<int (__thiscall content::BrowserMainLoop::*const &)(void),content::BrowserMainLoop *> [0x119507E4+36]
	base::internal::Invoker<base::internal::BindState<int (__thiscall content::BrowserMainLoop::*)(void),base::internal::UnretainedWrapper<content::BrowserMainLoop> >,int __cdecl(void)>::RunImpl<int (__thiscall content::BrowserMainLoop::*const &)(void),std::t [0x11950C5B+59]
	base::internal::Invoker<base::internal::BindState<int (__thiscall content::BrowserMainLoop::*)(void),base::internal::UnretainedWrapper<content::BrowserMainLoop> >,int __cdecl(void)>::Run [0x1195C774+36]
	base::internal::RunMixin<base::Callback<int __cdecl(void),1,1> >::Run [0x125BFF5F+63]
	content::StartupTaskRunner::RunAllTasksNow [0x1260195E+110]
	content::BrowserMainLoop::CreateStartupTasks [0x11958209+569]
	content::BrowserMainRunnerImpl::Initialize [0x11962B75+981]
	content::BrowserMain [0x1194D5DF+95]
	content::RunNamedProcessTypeMain [0x132C5727+135]
	content::ContentMainRunnerImpl::Run [0x132C5605+405]
	content::ContentMain [0x132C3784+100]
	content::BrowserTestBase::SetUp [0x03572B66+1430]
	InProcessBrowserTest::SetUp [0x024AA375+741]
	testing::internal::HandleExceptionsInMethodIfSupported<testing::Test,void> [0x036CAC04+52]
	testing::Test::Run [0x036DE17D+77]
	testing::TestInfo::Run [0x036DE3CD+173]
	testing::TestCase::Run [0x036DE2AF+191]
	testing::internal::UnitTestImpl::RunAllTests [0x036DE7D5+661]
	testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl,bool> [0x036CACC4+52]
	testing::UnitTest::Run [0x036DE50F+207]
	RUN_ALL_TESTS [0x024DBC4F+15]
	base::TestSuite::Run [0x024DBD53+115]
	ChromeTestSuiteRunner::RunTestSuite [0x0605649A+42]
	ChromeTestLauncherDelegate::RunTestSuite [0x06056462+34]
	content::LaunchTests [0x0355CE1F+431]
	LaunchChromeTests [0x06056420+96]
	main [0x060560E9+89]
	invoke_main [0x06054A8E+30] (f:\ddctools\crtcstartup\src\startup\exe_common.inl:64)
	__scrt_common_main_seh [0x06054990+336] (f:\ddctools\crtcstartup\src\startup\exe_common.inl:253)
	__scrt_common_main [0x0605483D+13] (f:\ddctools\crtcstartup\src\startup\exe_common.inl:296)
	mainCRTStartup [0x06054AA8+8] (f:\ddctools\crtcstartup\src\startup\exe_main.cpp:17)
	BaseThreadInitThunk [0x75CD338A+18]
	RtlInitializeExceptionChain [0x77D49F72+99]
	RtlInitializeExceptionChain [0x77D49F45+54]