GitLab

This CL moves out AutoclickMenuButton into a separate class so it can be
in the future reused by other menus that may want those buttons.

Bug: 1061068
Change-Id: Ie776231ea5f319f3405eb7d2b04c09497efe7b7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2100792Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Reviewed-by: Katie Dektar <katie@chromium.org>
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750634}