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This is explicitly done for the Extensions menu, but affect two pin
icons in ash too.

Bug: chromium:943702
Change-Id: I4a04afd6d41df4a9f0487dd0359539c69f7d5a1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065910Reviewed-by: Caroline Rising <corising@chromium.org>
Commit-Queue: Caroline Rising <corising@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Auto-Submit: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743245}