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This library provides access to RenderFrameImpl things but
WebFrameTestProxy is-a RenderFrameImpl and can be used instead.

R=creis@chromium.org

Bug: 866140
Change-Id: Iefdeef8de4fa70966119ac026f7be1b5c592a918
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2110071Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751804}