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This CL tries to verify that whenever WCO::ReadyToCommitNavigation has
been dispatched, subsequent WCO::DidFinishNavigation will return the same
RenderFrameHost consistently.

Change-Id: I3797b6c55b038941a65a92aa3439526e3ca62537
Reviewed-on: https://chromium-review.googlesource.com/977050
Commit-Queue: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545675}