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Creates a ToolbarCommands protocol so the ToolbarVC can cancel the omnibox edit.

Bug: 791092
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I5e283cfd1144b41c6f207103de153f0c6a4d7128
Reviewed-on: https://chromium-review.googlesource.com/804140
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521117}