Remove dead code: MenuRunnerImplCocoa

Bug: 829347
Change-Id: I56275cb690dc9aba050ae62ff3ca403dd4a601ba
Reviewed-on: https://chromium-review.googlesource.com/1087349
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566462}
5 files changed