Only clear Oobe errors on KeyDown to prevent clearing an immediate authentication error.
Only clear Oobe errors on KeyDown to prevent clearing an immediate authentication error.

BUG=103643
TEST=Enable the WebUI lock screen, lock screen, enter an incorrect password and observe error message remains on screen.


Review URL: http://codereview.chromium.org/8515011

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@109643 0039d316-1c4b-4281-b951-d872f2087c98

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