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Prior to this change, the engine browser test would only make
asssertions that the URL was changing and that the RenderWidget was
being created. Validating the page title is an easy way to make sure the
intended page is actually the one being sent.

BUG=628324

Review-Url: https://codereview.chromium.org/2224613002
Cr-Commit-Position: refs/heads/master@{#410398}