[MD settings] hide side nav drawer at 900px

chrome/browser/resources/settings/settings_ui/settings_ui.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="chrome://md-settings/direction_delegate.html">
 <link rel="import" href="chrome://md-settings/i18n_setup.html">
@@ skipping 100 matching lines @@
 
       .last {
         display: flex;
         justify-content: flex-end;
         width: 100%;
       }
     </style>
     <settings-router current-route="{{currentRoute}}"
         current-route-titles="{{currentRouteTitles}}">
     </settings-router>
-    <paper-drawer-panel drawer-width="256px" id="panel" narrow="{{isNarrow_}}">
+    <paper-drawer-panel drawer-width="256px" id="panel" narrow="{{isNarrow_}}"
+        responsive-width="900px">
       <paper-header-panel 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="menu" id="menu-button" paper-drawer-toggle>
@@ skipping 12 matching lines @@
             </paper-input>
           </div>
         </paper-toolbar>
         <settings-main prefs="{{prefs}}" current-route="{{currentRoute}}">
         </paper-icon-button>
       </paper-header-panel>
     </paper-drawer-panel>
   </template>
   <script src="settings_ui.js"></script>
 </dom-module>