Simplify Site Settings tests.

chrome/browser/resources/settings/site_settings/site_list.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icons/communication-icons.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-item/paper-item.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-item/paper-item-body.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-menu/paper-menu.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-menu/paper-submenu.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-menu-button/paper-menu-button.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://md-settings/settings_shared_css.html">
 <link rel="import" href="chrome://md-settings/site_settings/constants.html">
 <link rel="import" href="chrome://md-settings/site_settings/site_settings_behavior.html">
 <link rel="import" href="chrome://md-settings/site_settings/site_settings_prefs_browser_proxy.html">
 
 <dom-module id="settings-site-list">
   <link rel="import" type="css" href="site_list.css">
   <template>
     <style include="settings-shared"></style>
     <paper-submenu id="category" hidden on-paper-submenu-open="onToggle_"
         on-paper-submenu-close="onToggle_">
       <paper-item class="menu-trigger" hidden$="[[allSites]]">
         <div class="site-header horizontal layout">
-          <div class="flex"
+          <div class="flex" id="header"
               >[[computeSiteListHeader_(sites, categoryEnabled)]]</div>
           <iron-icon id="icon" icon="icons:expand-more"></iron-icon>
         </div>
       </paper-item>
 
       <paper-menu class="menu-content" id="listContainer">
-        <template is="dom-repeat" items="{{sites}}">
+        <template is="dom-repeat" items="[[sites]]">
           <div class="site-list horizontal layout center">
             <paper-item class="flex">
               <iron-icon icon="[[computeSiteIcon_(item)]]" item-icon>
               </iron-icon>
               <paper-item-body two-line on-tap="onOriginTap_" class="origin">
                 <div>[[item.origin]]</div>
                 <div secondary>[[item.embeddingOriginForDisplay]]</div>
               </paper-item-body>
 
               <paper-menu-button hidden$="[[allSites]]">
@@ skipping 13 matching lines @@
               </paper-menu-button>
             </paper-item>
           </div>
         </template>
 
       </paper-menu>
     </paper-submenu>
   </template>
   <script src="site_list.js"></script>
 </dom-module>