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This change adds an additional note to the comment for this method
highlighting the fact that the RenderFrameHost may change during
navigation and that this method only returns the final host. To observe
the change WebContentsObserver::RenderFrameHostChanged() should be used.

Bug: 898645
Change-Id: I716923758fae621c596b599c754e998d86324d20
Reviewed-on: https://chromium-review.googlesource.com/c/1330757
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608633}