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The comment said "In the first two cases [main frame and child frame],
the RenderFrame is not the root" and "For child frames, the root is
RenderFrame". It should have said "In the first two cases
the Render*Widget* is not the root"

Change-Id: I65e25da21326feb90b8a7b33d1f6da089aff0845
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359322Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Commit-Queue: Ken Buchanan <kenrb@chromium.org>
Auto-Submit: Johann Koenig <johannkoenig@google.com>
Cr-Commit-Position: refs/heads/master@{#799274}