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This CL cleans up the toolbar search icon as the experiment is launched.

Fixed: 1050994
Change-Id: I537f449d817ccc416a1477487292b27bc0de454b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050268Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740589}