Bug 975928 - Make test_buffered.html load media using xhr, so it's deterministic. r=kinetik
Bug 975928 - Use our estimate for MP3 duration rather than GStreamer's for buffered range end when fully buffered in MP3/GStreamer. r=alessandro.d
Bug 975858 - Ensure that MediaResource dtor always runs on the main thread, making it safe to deref on non-main threads. r=roc
Bug 975933 - Increase precision of bug516323.indexed.ogv index's timestamp denominator to prevent precision mismatch causing test failures. r=rillian