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MacViewsBrowser, it is necessary to open bookmark menus on mouse
over. So, implement the unimplemented function IsWindowUnderCursor().

MenuController: :ShowSiblingMenu() use IsWindowUnderCursor(). On
Bug: 762764
Change-Id: Ifbf93085a0546f7e3c2b6070267e62212b84bddd
Reviewed-on: https://chromium-review.googlesource.com/654400Reviewed-by: ccameron <ccameron@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539165}