crash log for renderer (pid <unknown>):
STDOUT: This is a testharness.js-based test.
STDOUT: FAIL Check that media tracks and their properties are populated properly assert_equals: videoTrack.language expected "eng" but got ""
STDOUT: FAIL Media tracks must be removed when the SourceBuffer is removed from the MediaSource assert_equals: videoTracks.length expected 0 but got 1
STDOUT: PASS Media tracks must be removed when the HTMLMediaElement.src is changed
STDOUT: PASS Media tracks must be removed when HTMLMediaElement.load() is called
STDOUT: Harness: the test ran to completion.
STDOUT: 
STDERR: [7408:5240:1027/223201.683:36469086:ERROR:audio_manager_base.cc(316)] Invalid audio output parameters received; using fake audio path. Channels: 0, Sample Rate: 0, Bits Per Sample: 0, Frames Per Buffer: 0
