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This CL clarifies the nature of undead RenderWidgets.

Bug: 419087
Change-Id: Ib6c352b6ce81b1c4ee133c9658b03108d6e48977
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1847945
Commit-Queue: Erik Chen <erikchen@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Auto-Submit: Erik Chen <erikchen@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703945}