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There are about 5 accessors in WebContentImpl that end up
just going through that class to get to RenderWidgetHostView.

This CL moves those accessors onto a new class with an interface in
RenderWidgetHostView.java and java implementation in
RenderWidgetHostViewImpl.java that links to the native
RanderWidgetHostViewAndroid.

Updates callers to access RWHV through
WebContents#getRenderWidgetHostView, which can return null.

BUG=974430

Change-Id: I815c4f1791164aea0303c83fb5da62f7e87df274
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1663398
Commit-Queue: Donn Denman <donnd@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Auto-Submit: Donn Denman <donnd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671774}