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This allows other coordinators to use the LocationBarSteadyViewMediator
if they want to use the LocationBarSteadyView.

Bug: 1094335
Change-Id: I6fd912f8a2d560d7f3928b2201d42c8fff2b937a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526425Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Cr-Commit-Position: refs/heads/master@{#827271}