https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7%20%28dbg%29/builds/11762

http/tests/devtools/tracing/frame-model-instrumentation.html:
CONSOLE ERROR: line 57: Uncaught TypeError: Cannot read property 'dispatchMessage' of undefined
CONSOLE MESSAGE: line 334: Internal watchdog triggered at 20 seconds. Test timed out.

virtual/mojo-loading/http/tests/devtools/tracing/frame-model-instrumentation.html:
CONSOLE MESSAGE: line 334: Internal watchdog triggered at 20 seconds. Test timed out.