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This is always false except for in tests and menu_example.cc which is
not used. This helps simplify MenuButton for the Button cleanup task.

Bug: 901183
Change-Id: If5a3cf7b6ba1ce5618548d112df1c4404b2ae181
Reviewed-on: https://chromium-review.googlesource.com/c/1324375Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Charlene Yan <cyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607061}