MD Settings: Fix names of icons which had been moved to shared iconset

chrome/browser/resources/settings/settings_menu/settings_menu.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/iron-icon/iron-icon.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://md-settings/icons.html">
 <link rel="import" href="chrome://md-settings/settings_shared_css.html">
 
 <dom-module id="settings-menu">
   <template>
@@ skipping 127 matching lines @@
 </if>
           <div data-section="passwordsAndForms" on-tap="openPage_">
             <iron-icon icon="settings:assignment"></iron-icon>
             $i18n{passwordsAndAutofillPageTitle}
           </div>
           <div data-section="languages" on-tap="openPage_">
             <iron-icon icon="settings:language"></iron-icon>
             $i18n{languagesPageTitle}
           </div>
           <div data-section="downloads" on-tap="openPage_">
-            <iron-icon icon="settings:file-download">
+            <iron-icon icon="cr:file-download">
             </iron-icon>
             $i18n{downloadsPageTitle}
           </div>
           <div data-section="a11y" on-tap="openPage_">
             <iron-icon icon="settings:accessibility">
             </iron-icon>
             $i18n{a11yPageTitle}
           </div>
 <if expr="not chromeos">
           <div data-section="system" on-tap="openPage_">
@@ skipping 10 matching lines @@
       <div class="separator"></div>
       <paper-submenu data-page="about">
         <div class="menu-trigger" on-tap="openPage_" data-section="">
           $i18n{aboutPageTitle}
         </div>
       </paper-submenu>
     </paper-menu>
   </template>
   <script src="settings_menu.js"></script>
 </dom-module>