Update bower.json for Polymer elements and add PRESUBMIT.py

third_party/polymer/v1_0/components-chromium/paper-dialog-behavior/paper-dialog-common.css

 /*
 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
 
@@ skipping 10 matching lines @@
   @apply(--paper-dialog);
 }
 
 :host > ::content > * {
   margin-top: 20px;
   padding: 0 24px;
 }
 
 :host > ::content > .no-padding {
   padding: 0;
-};
+}
 
 :host > ::content > *:first-child {
   margin-top: 24px;
 }
 
 :host > ::content > *:last-child {
   margin-bottom: 24px;
 }
 
 :host > ::content h2 {
   position: relative;
   margin: 0;
   @apply(--paper-font-title);
 
   @apply(--paper-dialog-title);
 }
 
 :host > ::content .buttons {
   position: relative;
   padding: 8px 8px 8px 24px;
   margin: 0;
 
   color: var(--paper-dialog-button-color, --default-primary-color);
 
   @apply(--layout-horizontal);
   @apply(--layout-end-justified);
 }