[MD settings] favicons for OnStartup url settings

chrome/browser/resources/settings/on_startup_page/startup_urls_page.html

 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input.html">
+<link rel="import" href="chrome://resources/js/util.js">
 <link rel="import" href="chrome://md-settings/settings_dialog.html">
 <link rel="import" href="chrome://md-settings/settings_shared_css.html">
 
 <dom-module id="settings-startup-urls-page">
   <link rel="import" type="css" href="on_startup_shared.css">
   <template>
-    <style include="settings-shared"></style>
+    <style include="settings-shared">
+      .favicon-image {
+        background-size: contain;
+        background-repeat: no-repeat;
+        height: 16px;
+        width: 16px;
+      }
+    </style>
     <div class="list-frame vertical-list">
       <template is="dom-repeat" items="[[startupPages_]]">
         <div class="list-item">
-          <iron-icon class="secondary" icon="image:brightness-1"
-              item-icon></iron-icon>
+          <div class="favicon-image"
+              style="background-image: [[getIconSet_(item.url)]]">
+          </div>
           <div class="middle">
             <div class="text-elide">[[item.title]]</div>
             <div class="text-elide secondary">[[item.url]]</div>
           </div>
           <iron-icon on-tap="onRemoveUrlTap_" icon="clear"></iron-icon>
         </div>
       </template>
       <div class="list-item list-button" on-tap="onAddPageTap_"
           i18n-content="onStartupAddNewPage">
       </div>
@@ skipping 15 matching lines @@
               id="cancel" i18n-content="cancel"></paper-button>
           <paper-button class="action-button" on-tap="onAddTap_"
               i18n-content="add" disabled="[[!isAddEnabled_(newUrl_)]]">
           </paper-button>
         </div>
       </div>
     </settings-dialog>
   </template>
   <script src="startup_urls_page.js"></script>
 </dom-module>