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The new name would be better since we support remapping the right control key. Do the same for chromeos::input_method::kLeftAlt.

This cleanup is for issue 115112.

BUG=115112
TEST=none
TBR=csilv@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10416028

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138449 0039d316-1c4b-4281-b951-d872f2087c98