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This CL shows the delete button's inkdrop highlight when the button
is under pseudo focus and protects the feature by a browser test case.

Bug: 1151493
Change-Id: I3b42cb001e63002b658b84c662338e773efe5c09
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2583208Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: David Black <dmblack@google.com>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835829}