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Convert the remaining bits in both the implementation and clients from
the browser and renderer processes for the FrameSinkVideoCapturer interface,
and adapt unit tests.

Bug: 955171, 978694
Change-Id: I87d6d2758d45f44554a1bd6c88fa0358d0709a0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863091
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708120}