Turn on default ink drop handling for new tab button.

InkDropGestureHandler is now InkDropEventHandler and handles mouse and
gesture events.
https://chromium-review.googlesource.com/c/chromium/src/+/1344262

Bug: 910050
Change-Id: Iab91ca41f100cf3d0ba34b54112bc1fecf49406d
Reviewed-on: https://chromium-review.googlesource.com/c/1355490
Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Charlene Yan <cyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612387}
1 file changed