[cleanup] Removed dead code from avatar selection screen.

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

 /* Copyright 2013 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.
  */
 
 #user-image {
   min-height: 443px;
   padding: 70px 17px 21px;
   width: 702px;
 }
@@ skipping 60 matching lines @@
   position: relative;
 }
 
 #profile-image {
   position: relative;
 }
 
 /* White background for spinner styled like user image */
 #profile-image .spinner-bg {
   background-color: white;
+  display: none;
   height: 50px;
   left: 3px;
   position: absolute;
   top: 3px;
-  visibility: hidden;
   width: 50px;
 }
 
 .profile-image-loading #profile-image .spinner-bg {
-  visibility: visible;
+  display: block;
 }
 
 #profile-image .spinner {
   left: 14px;
   position: absolute;
   top: 14px;
 }
 
 html[dir=rtl] #user-image-preview {
   float: left;
@@ skipping 151 matching lines @@
 }
 
 .camera.live:not(.online) .user-image-stream-area .spinner {
   display: block;
 }
 
 #user-images-loading {
   color: #9c9c9c;
 }