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The new styling should only apply to the new
customization menu.

Bug: 962353
Change-Id: I8f9ff9dc925a58c9403576c0d33b845d8673d523
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1609601Reviewed-by: Gayane Petrosyan <gayane@chromium.org>
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659127}