GitLab

Handling button press may delete the button view, so referecing the
hover button after button press callback is called is not safe.

BUG=1142568

Change-Id: I4b062cfc1ca632bf590df7892b58592680a38ab7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618577
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842282}