Delete RenderWidgetHostView APIs related to tab video capture.

Remove RenderWidgetHostView::CopyFromSurfaceToVideoFrame() and all
FrameSubscriber interfaces. They served us well for the past 5 years,
but it's time to retire them in favor of the new frame sink-based tab
capture implementation.

Almost all of this change is code deletion. Only minor, trivial
clean-ups were performed in files touched.

Bug: 754872
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: Iec3b5754fccf800d6cbf70c15fcc0f6779da960f
Reviewed-on: https://chromium-review.googlesource.com/896588
Commit-Queue: Yuri Wiitala <miu@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Reviewed-by: Yi Xu <yiyix@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534887}
21 files changed