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Issue crbug.com/454029 was closed as won't fix, and it seems like the
VideoEncodeAccelerator callbacks won't be removed for now.

This CL converts them into their proper {Once|Repeating} callback forms.

These are the last callbacks that need to be converted in media/cast,
and media/ as a whole (although there are still a few uses of
base::Bind in media/).

Bug: 1007801, 714018
Change-Id: Ia133555172d91cdce4a42f48127424d910fbe268
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566355Reviewed-by: David Bienvenu <davidbienvenu@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832454}