It is currently failing reliably on all WebRTC Windows bots.

First failure for various bots:
https://build.chromium.org/p/chromium.webrtc/builders/Win7%20Tester/builds/28171
https://build.chromium.org/p/chromium.webrtc/builders/Win8%20Tester/builds/27197
https://build.chromium.org/p/chromium.webrtc/builders/Win10%20Tester/builds/8932

WebRTC FYI:
https://build.chromium.org/p/chromium.webrtc.fyi/builders/Win7%20Tester/builds/5176
https://build.chromium.org/p/chromium.webrtc.fyi/builders/Win10%20Tester/builds/3598

The FYI bots have empty blamelists so the culprit is most likely in Chromium.

Sample failure:

[ RUN      ] PPAPINaClPNaClTest.MediaStreamVideoTrack
[5232:5668:0801/083438:WARNING:chrome_browser_main_win.cc(419)] Command line too long for RegisterApplicationRestart
[5728:4692:0801/083438:ERROR:singleton_hwnd.cc(34)] Cannot create windows on non-UI thread!
[5232:4532:0801/083438:WARNING:embedded_test_server.cc(202)] Request not handled. Returning 404: /favicon.ico
[5232:6052:0801/083440:ERROR:nacl_process_host.cc(337)] NaCl process exited with status -1073741674 (0xc0000096)
[5232:5668:0801/083440:INFO:CONSOLE(0)] "NativeClient: NaCl module crashed", source: http://127.0.0.1:50709/test_case.html?mode=nacl_pnacl&testcase=MediaStreamVideoTrack (0)
e:\b\c\b\win_builder\src\chrome\test\ppapi\ppapi_test.cc(249): error: Value of: handler.message().c_str()
  Actual: "Plugin crashed. 'NaCl module crashed'"
Expected: "PASS"
[5232:6052:0801/083440:ERROR:node_channel.cc(827)] Failed to duplicate one or more outgoing handles.
[5232:5668:0801/083441:WARNING:url_request_context_getter.cc(43)] URLRequestContextGetter leaking due to no owning thread.
[  FAILED  ] PPAPINaClPNaClTest.MediaStreamVideoTrack, where TypeParam =  and GetParam() =  (3192 ms)
[95/95] PPAPINaClPNaClTest.MediaStreamVideoTrack (3475 ms)
Retrying 1 test (retry #2)
[ RUN      ] PPAPINaClPNaClTest.MediaStreamVideoTrack
[1552:5488:0801/083441:WARNING:chrome_browser_main_win.cc(419)] Command line too long for RegisterApplicationRestart
[1096:5136:0801/083441:ERROR:singleton_hwnd.cc(34)] Cannot create windows on non-UI thread!
[1552:5632:0801/083442:WARNING:embedded_test_server.cc(202)] Request not handled. Returning 404: /favicon.ico
[1552:5180:0801/083442:ERROR:nacl_process_host.cc(337)] NaCl process exited with status -1073741674 (0xc0000096)
[1552:5488:0801/083442:INFO:CONSOLE(0)] "NativeClient: NaCl module crashed", source: http://127.0.0.1:50715/test_case.html?mode=nacl_pnacl&testcase=MediaStreamVideoTrack (0)
e:\b\c\b\win_builder\src\chrome\test\ppapi\ppapi_test.cc(249): error: Value of: handler.message().c_str()
  Actual: "Plugin crashed. 'NaCl module crashed'"
Expected: "PASS"
[1552:5180:0801/083442:ERROR:node_channel.cc(827)] Failed to duplicate one or more outgoing handles.
[1552:5488:0801/083443:WARNING:url_request_context_getter.cc(43)] URLRequestContextGetter leaking due to no owning thread.
[  FAILED  ] PPAPINaClPNaClTest.MediaStreamVideoTrack, where TypeParam =  and GetParam() =  (1866 ms)
[96/96] PPAPINaClPNaClTest.MediaStreamVideoTrack (2182 ms)
Retrying 1 test (retry #3)
[ RUN      ] PPAPINaClPNaClTest.MediaStreamVideoTrack
[1508:3508:0801/083443:WARNING:chrome_browser_main_win.cc(419)] Command line too long for RegisterApplicationRestart
[6000:5912:0801/083443:ERROR:singleton_hwnd.cc(34)] Cannot create windows on non-UI thread!
[1508:4064:0801/083444:WARNING:embedded_test_server.cc(202)] Request not handled. Returning 404: /favicon.ico
[1508:6048:0801/083445:ERROR:nacl_process_host.cc(337)] NaCl process exited with status -1073741674 (0xc0000096)
[1508:3508:0801/083445:INFO:CONSOLE(0)] "NativeClient: NaCl module crashed", source: http://127.0.0.1:50721/test_case.html?mode=nacl_pnacl&testcase=MediaStreamVideoTrack (0)
e:\b\c\b\win_builder\src\chrome\test\ppapi\ppapi_test.cc(249): error: Value of: handler.message().c_str()
  Actual: "Plugin crashed. 'NaCl module crashed'"
Expected: "PASS"
[5616:4080:0801/083445:ERROR:node_controller.cc(1099)] Could not be introduced to peer BA62A4FB885B28A.BC6561D50EDE1BA0
[1508:3508:0801/083445:WARNING:url_request_context_getter.cc(43)] URLRequestContextGetter leaking due to no owning thread.
[  FAILED  ] PPAPINaClPNaClTest.MediaStreamVideoTrack, where TypeParam =  and GetParam() =  (2053 ms)
[97/97] PPAPINaClPNaClTest.MediaStreamVideoTrack (2341 ms)
1 test failed:
    PPAPINaClPNaClTest.MediaStreamVideoTrack (e:\b\c\b\win_builder\src\chrome\test\ppapi\ppapi_browsertest.cc:1164)