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Currently we pass an ArrayBuffer which does not work for large files
such as video. Passing a File works, and doesn't require a copy.

Add media/video to the list of handlers now we know it works. Tested
manually with a 5GB video, and covered by existing unit and integration
tests (with smaller files).

Update the existing file_handler.accept map rather than adding a new
handler due to https://crbug.com/1047509.

BUG=996088, b/144865801

Change-Id: I46b3ba53676534e06ba039c9a52c8701b4d1d432
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2029532Reviewed-by: Bugs Nash <bugsnash@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737175}