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Since HoverButton was changed to no longer inherit from MenuButton, the
behavior has to be readded back into the controller.

Bug: 991877
Change-Id: I7d0987eb1b30423753560feee2d8a42bb6d71cc9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1745289Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Charlene Yan <cyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#685383}