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This matches Aura behavior. In addition, native Mac menus take key focus
so this matches platform behavior better, too.

BUG=986247
TEST=as in bug

Change-Id: I92dc11c73d390f348b087aaaa8dd3b15e62b86b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1718453Reviewed-by: Leonard Grey <lgrey@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682299}