MD History: Add responsive layout which hides the sidebar in thin windows

chrome/browser/resources/settings/settings_ui/settings_ui.html

 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-drawer-panel/paper-drawer-panel.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-header-panel/paper-header-panel.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-input/paper-input.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-toolbar/paper-toolbar.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="/direction_delegate.html">
@@ skipping 181 matching lines @@
         responsive-width="900px">
       <paper-header-panel drawer id="drawer">
         <paper-toolbar class="toolbar">
           <div class="heading flex">$i18n{settings}</div>
         </paper-toolbar>
         <settings-menu current-route="{{currentRoute}}">
         </settings-menu>
       </paper-header-panel>
       <paper-header-panel main>
         <paper-toolbar class="toolbar">
-          <paper-icon-button icon="settings:menu" id="menu-button"
+          <paper-icon-button icon="cr:menu" id="menu-button"
               paper-drawer-toggle>
           </paper-icon-button>
           <div class="heading" id="main-title">
             $i18n{settings}
           </div>
           <div class="last">
             <paper-icon-button icon="cr:search" toggles>
             </paper-icon-button>
             <paper-input id="search-input" label="$i18n{internalSearch}"
                 no-label-float>
               <!-- TODO(dschuyler): implement internal search. -->
               <paper-icon-button suffix icon="cr:cancel">
               </paper-icon-button>
             </paper-input>
           </div>
         </paper-toolbar>
         <settings-main prefs="{{prefs}}" current-route="{{currentRoute}}">
         </settings-main>
       </paper-header-panel>
     </paper-drawer-panel>
   </template>
   <script src="settings_ui.js"></script>
 </dom-module>