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

chrome/browser/resources/chromeos/sim_unlock.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.
+ */
+
 .error {
   color: red;
 }
 
 #pin-error-msg {
   height: 25px;
   margin: 5px auto 5px auto;
 }
 
 .content-area {
@@ skipping 71 matching lines @@
 }
 
 .choose-pin-input-area {
   margin: 5px 5px 5px 5px;
   width: 125px; 
 }
 
 #choose-pin-action-area {
   padding: 6px;
 }