Fixed positions of label and border windows to avoid flickering on initial show of login screen.
Fixed positions of label and border windows to avoid flickering on initial show of login screen.

BUG=cros:4356
TEST=Verify that no white rectangles flicker near user pods on initial show.

Review URL: http://codereview.chromium.org/2887002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@51242 0039d316-1c4b-4281-b951-d872f2087c98

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