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Why would the browser be changing the page visibility after it has
detached the main frame, closing the RenderWidget and destroying the
WebView? It wouldn't.

R=dcheng@chromium.org

Change-Id: Ibc49c8b9ffbcf174819d88423125ca2e47c775d8
Bug: 894899
Reviewed-on: https://chromium-review.googlesource.com/c/1323698
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606170}