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This CL only adds a flag for a previously added feature: group
suggestions by search vs URL.

Bug: 966462
Change-Id: I37d956baadad1a2bb5ea9968f4959933c0c61b2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1631299
Commit-Queue: Kevin Bailey <krb@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663809}