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The existing code bases the decision on whether the toolbar button
icons have a custom color, which causes accessibility problems.

Bug: 1153079
Change-Id: I0f9996891a7327ffed3d45b77944fa33481b8b0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587578
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Charlene Yan <cyan@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836793}