Allow Enter to be used to enter a PIN.
Allow Enter to be used to enter a PIN.

BUG=None
TEST=Manual

Review URL: https://chromiumcodereview.appspot.com/10041045

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@132883 0039d316-1c4b-4281-b951-d872f2087c98

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