It is also flaky on Win 7 Tests x64 (1):

https://build.chromium.org/p/chromium.win/builders/Win%207%20Tests%20x64%20%281%29/builds/18262
https://build.chromium.org/p/chromium.win/builders/Win%207%20Tests%20x64%20%281%29/builds/18254

6 of 20 recent Win 7 tests failed.

https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.win%2FWin_7_Tests_x64__1_%2F18270%2F%2B%2Frecipes%2Fsteps%2Fbrowser_tests_on_Windows-7-SP1%2F0%2Flogs%2FWorkerDevToolsSanityTest.PauseInSharedWorkerInitialization%2F0

[ RUN      ] WorkerDevToolsSanityTest.PauseInSharedWorkerInitialization
HTTP server started on http://127.0.0.1:54551...
sending server_data: {"host": "127.0.0.1", "port": 54551} (36 bytes)
[5300:5496:1108/121538:ERROR:CONSOLE(3289)] "Request ServiceWorker.enable failed. {"code":-32601,"message":"'ServiceWorker.enable' wasn't found"}", source: chrome-devtools://devtools/bundled/inspector.js (3289)
[5300:5496:1108/121538:ERROR:CONSOLE(3289)] "Request Inspector.enable failed. {"code":-32601,"message":"'Inspector.enable' wasn't found"}", source: chrome-devtools://devtools/bundled/inspector.js (3289)
Backtrace:
	blink::WebScrollbarThemeClientImpl::value [0x000000014460A7D7+7]
	blink::scheduler::TaskQueueManager::ProcessTaskFromWorkQueue [0x0000000142FBE8EE+1550]
	blink::scheduler::TaskQueueManager::DoWork [0x0000000142FBDA32+462]
	base::internal::InvokeHelper<1,void>::MakeItSo<void (__cdecl blink::scheduler::TaskQueueManager::*const & __ptr64)(base::TimeTicks,bool) __ptr64,base::WeakPtr<blink::scheduler::TaskQueueManager> const & __ptr64,base::TimeTicks const & __ptr64,bool const & [0x00000001426CEE00+112]
	base::debug::TaskAnnotator::RunTask [0x00000001412DC311+353]
	base::MessageLoop::RunTask [0x000000014126E957+1367]
	base::MessageLoop::DoWork [0x000000014126D99A+426]
	base::MessagePumpDefault::Run [0x00000001412DE356+326]
	base::RunLoop::Run [0x00000001412713CE+46]
	content::RendererMain [0x0000000143B489E4+676]
	content::RunNamedProcessTypeMain [0x000000014124AD4E+178]
	content::ContentMainRunnerImpl::Run [0x000000014124AC43+203]
	content::ContentMain [0x000000014124A0D8+48]
	content::LaunchTests [0x000000014174E91E+582]
	main [0x0000000143F6345F+83]
	__scrt_common_main_seh [0x0000000143F1E859+285] (f:\ddctools\crtcstartup\src\startup\exe_common.inl:253)
	BaseThreadInitThunk [0x0000000077905A4D+13]
	RtlUserThreadStart [0x0000000077B3B831+33]
c:\c\win\src\chromerowser\devtools\devtools_sanity_browsertest.cc(141): error: Value of: result
  Actual: "[FAILED] Timeout exceeded: 20 sec"
Expected: "[OK]"
[  FAILED  ] WorkerDevToolsSanityTest.PauseInSharedWorkerInitialization, where TypeParam =  and GetParam() =  (21736 ms)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a22f5c73b8d5590bcd1603729eac49e2a33d9600

commit a22f5c73b8d5590bcd1603729eac49e2a33d9600
Author: scheib <scheib@chromium.org>
Date: Tue Nov 08 23:01:43 2016

Disabling DevTools test PauseInSharedWorkerInitialization on Windows.

6 of 20 recent Win 7 tests failed. See bug comments for log.

BUG= 663351 
TBR=pfeldman@chromium.org

Review-Url: https://codereview.chromium.org/2486993002
Cr-Commit-Position: refs/heads/master@{#430744}

[modify] https://crrev.com/a22f5c73b8d5590bcd1603729eac49e2a33d9600/chrome/browser/devtools/devtools_sanity_browsertest.cc