[WebUI] Fix all CSS nits in chrome/browser/resources/chromeos.

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

 /* Copyright (c) 2012 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 21 matching lines @@
 html[dir=rtl] #signin-right {
   left: -150px;
 }
 
 .signin-text {
   color: #666;
   margin-top: 20px;
 }
 
 .signin-link {
-  color: #254f9b;
+  color: rgb(37, 79, 155);
   cursor: pointer;
   text-decoration: none;
 }
 
 #signin-frame {
   background-color: #fefefe;
   border: 1px solid lightgray;
   height: 100%;
   width: 340px;
 }
@@ skipping 10 matching lines @@
 }
 
 /* Position to be aligned with the login box in iframe  */
 #login-box {
   height: 31px;
   position: absolute;
   top: 77px;
   visibility: hidden;
   z-index: -1;
 }