[Bug 19531] simplify MIME type capability detection

https://www.w3.org/Bugs/Public/show_bug.cgi?id=19531

Philip Jägenstedt <philipj@opera.com> changed:

           What    |Removed                     |Added
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--- Comment #1 from Philip Jägenstedt <philipj@opera.com> ---
http://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#byte-stream-formats
says

"Byte stream format specifications based on WebM and the ISO Base Media File
Format are provided below. If these formats are supported then the byte stream
formats described below must be supported."

In other words, the spec requires that if you support WebM in plain <video>,
then you must also support it using MSE. This means that you can just use
HTMLMediaElement.canPlayType(), which is synchronous.

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