GitLab

When notification inline settings is opened from the top right gear icon
using by keyboard, it crashed as animation requires the event to be
LocatedEvent but it's not.

TEST=manual
BUG=823646

Change-Id: Ia683de86e042f010ac4bb0ee645fff170547b9fa
Reviewed-on: https://chromium-review.googlesource.com/974922
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545738}