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This CL adds a default (or fallback) icon for Answers in Suggest that
don't have a specific icon.

Bug: 838733
Change-Id: I723d64e29f8222e873345c6e04d90e1b26cb1631
Reviewed-on: https://chromium-review.googlesource.com/1108514Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568999}