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This CL adds a WebContentsObserver consistency check inside
WebContentsObserverConsistencyChecker::RenderFrameHostChanged to
make sure that for every subframe,
WebContentsObserver::RenderFrameCreated is dispatched before
WebContentsObserver::RenderFrameHostChanged.

Previous CL (https://crrev.com/c/2614467) modified the
way the RenderFrameCreated and RenderFrameHostChanged
WebContentObserver callbacks were dispatched in the case of
sub-frames, ensuring this consistency check.

BUG=1097143

Change-Id: I2564fffad342d0ebf4945166b829b1b6e1f57b3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628968
Commit-Queue: Sreeja Kamishetty <sreejakshetty@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846119}