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This CL modifies CrToolbar to allow users of CrToolbar to not set the
autofocus attribute to prevent CrToolbar's search bar from being
autofocused.

Bug: b:157737119
Change-Id: I449f5784e13323377a8b88261c02a9a6a8d90307
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276340
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784212}