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webwidget_ was renamed to webwidget_internal_ because there were two
WebWidgets - one in RenderWidget and one in RenderViewImpl. Now there is
one again, so rename it back.

Update comments about lifetimes of WebWidget wrt RenderWidget and
RenderViewImpl.

R=avi@chromium.org

Bug: 419087
Change-Id: Ib65d0bd223203109181b4e3be6a5e8f9136cd710
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824289Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699843}