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The right command key shares a key code with the windows context menu
key. For key event purposes, we don't want to collapse it together
with the left command key in case users have remapped it.

Instead, disable the entire keyboard context menu code path, since
neither of those shortcuts should work on Mac.

Bug: 827618
Change-Id: I05123bde9cd43cf5ba01aaf33d406d8300cbe27b
Reviewed-on: https://chromium-review.googlesource.com/988392
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547818}