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Apple’s documentation on menus is incorrect (see the linked bug)
so the test we were doing was wrong. And anyway, why double-check
the shortcut key? We're in -applicationShouldTerminate: so the
user *did* give a quit command. Just assume that the system did
the right thing and match on the fact that we're processing a
key down.

Also do some cleanup of comments and names that are just wrong.

BUG=142944

Change-Id: I797a97d3675e67e2426cc296e7c8642e08b91504
Reviewed-on: https://chromium-review.googlesource.com/c/1345030Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610853}