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This removes the remaining TODOs pointing to bug 419087, 583347, and
912193 when they are about RenderWidget and not RenderWidgetHost. TODOs
about the RenderWidgetHost are clarified to explain that RenderWidget is
destroyed now.

R=avi@chromium.org

Bug: 419087, 583347, 912193
Change-Id: Ia491d2644997bac9d93bd319fb2ca0133997d86e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2006209Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Auto-Submit: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737954}