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The VideoDecoder and VideoTrackReader share the same callback definition
to send VideoFrames back to JS. This CL updates the name of the callback
to a more generic name usable by both.

Bug: 1080834
Change-Id: I2b5cd5d2ed775abd2adfff582320617fd954b85b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2203217
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Auto-Submit: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771126}