[mac] Send cmd-c and friends back to browser.
[mac] Send cmd-c and friends back to browser.

Fixes cmd-c, cmd-v, cmd-x, cmd-a.

The menu blinking is worth the extra IPC hop.

BUG=25254
TEST=Select text, hit cmd-c. "Edit" menu should blink. Hit cmd-v. "Edit" menu should blink again, correct text should be pasted.

Review URL: http://codereview.chromium.org/330014

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@30045 0039d316-1c4b-4281-b951-d872f2087c98

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