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These DCHECKs don’t tell us anything other than that we fail to update
the browser-side notion of location when a document writes into an
about:blank document, but we know that.

BUG=820063,718570

Change-Id: I469d75afaafcd87c98529037a1fbbca155ce806c
Reviewed-on: https://chromium-review.googlesource.com/956282Reviewed-by: Nasko Oskov <nasko@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541989}