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This CL removes RenderWidgetHostOwnerDelegate::GetFocusedFrame
and GetFocusedFrame from RenderViewHostImpl inherited from
RenderWidgetHostOwnerDelegate since it could get the FrameTree
from RenderWidgetHostDelegate::GetFrameTree() introduced on [1].

[1] https://crrev.com/c/2245450

Bug: 1094841
Change-Id: I7c427942d4ce2b93cde70ed19946d7411799cc85
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2253598
Commit-Queue: Julie Kim <jkim@igalia.com>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782850}