[cros] Error bubble on login is displayed to the left of Gaia frame.

chrome/browser/resources/chromeos/login/screen_gaia_signin.css

 /* Copyright (c) 2011 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #gaia-signin {
   -webkit-box-align: center;
   -webkit-box-pack: center;
   display: -webkit-box;
   height: 470px;
@@ skipping 43 matching lines @@
 #gaia-loading {
   -webkit-box-align: center;
   -webkit-box-pack: center;
   bottom: 0;
   display: -webkit-box;
   left: 0;
   position: absolute;
   right: 0;
   top: 0;
 }
+
+/* Position to be aligned with the login box in iframe  */
+#login-box {
+  position: absolute;
+  top: 77px;
+  visibility: hidden;
+  width: 32px;
+  z-index: -1;
+}