https://build.chromium.org/p/chromium.fyi/builders/Fuchsia/builds/8892

https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.fyi%2FFuchsia%2F8892%2F%2B%2Frecipes%2Fsteps%2Fmedia_unittests%2F0%2Fstdout

[00142.656] 02461.02560> [ RUN      ] FFmpegDemuxerTest.Initialize_OpenFails
[00142.656] 02461.02560> ../../media/base/test_helpers.cc:124: Failure
[00142.656] 02461.02560> Failed
[00142.656] 02461.02560> Timed out waiting for message loop to quit
[00142.656] 02461.02560> ../../media/base/test_helpers.cc:107: Failure
[00142.656] 02461.02560> Value of: signaled_
[00142.656] 02461.02560>   Actual: false
[00142.656] 02461.02560> Expected: true
[00142.656] 02461.02560> ../../media/base/test_helpers.cc:108: Failure
[00142.656] 02461.02560>       Expected: expected
[00142.656] 02461.02560>       Which is: 12
[00142.656] 02461.02560> To be equal to: status_
[00142.656] 02461.02560>       Which is: 0
[00142.656] 02461.02560> [  FAILED  ] FFmpegDemuxerTest.Initialize_OpenFails (40699 ms)

Maybe related to  bug 755551 .