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ContentBrowserClient has had that method for a while, but it hasn't been
used.  I'm adding a use of it, so am implementing it in subclasses.

Bug: 841445
Change-Id: I9826cabdfdb2493d96583c1b7a2c0e2710ec07e8
Reviewed-on: https://chromium-review.googlesource.com/1151456Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579499}