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NotificationMD already had a clip installed previously, so the mask code
was never called, so its safe to just delete.

ScrollArrowView has only one override ScrollableScrollArrowView which
turns of ink drop ripples and highlights, so its safe to remove the ink
drop codes.

Test: manual
Bug: 1056490
Change-Id: I3e4b068f3e819901b1da7d4ab42bc74e62a0295f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2308450Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790134}