[Problem/Bug]: when navigating directly to a video or audio, the title is not changed

[jls28]

here the test :

open any page with a title;
then navigate to a video or audio (a .mp4 or .wav local file or ex : http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4) :
this open and play the video/audio,
but the title is unchanged because there no DocumentTitleChanged
event generated.
It is probably a bug because all other pages, even about:blank generate a DocumentTitleChanged event.

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