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Also, don't trust the renderer process to send the correct URL.

Bug: 823864
Change-Id: I1f5c1c7908d8157240b5a7d5fc2df944267cf537
Reviewed-on: https://chromium-review.googlesource.com/979399
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547114}