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This CL adds a fallback to display MostVisited URLs when personalized
zero-query is enabled with ChromeHomePersonalizedOmniboxSuggestions but
the user's default search engine is not Google.

Bug: 781994
Change-Id: I489052f3a33e2f97d86138760f8f2d135515c241
Reviewed-on: https://chromium-review.googlesource.com/777502
Commit-Queue: Gheorghe Comanici <gcomanici@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519855}