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This fixes a bug where users feel like it's hard to hit the close
button within the scroll pad.

Bug: 984669
Change-Id: I6f241afc011a1e713e74c87f00dba364fe895fd8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715549
Auto-Submit: Katie Dektar <katie@chromium.org>
Commit-Queue: Anastasia Helfinstein <anastasi@google.com>
Reviewed-by: Anastasia Helfinstein <anastasi@google.com>
Cr-Commit-Position: refs/heads/master@{#680476}