[MD settings] change menu and domain icons

ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-media-query/iron-media-query.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_toolbar/cr_toolbar_search_field.html">
 
 <dom-module id="cr-toolbar">
   <template>
     <style>
       :host {
         --cr-toolbar-field-width: 580px;
@@ skipping 111 matching lines @@
         font-size: 20px;  /* Shouldn't change if default font-size changes. */
         line-height: 20px;
         padding: 0;
         width: 20px;
       }
     </style>
     <div id="leftContent">
       <div id="leftSpacer">
         <!-- Note: showing #menuPromo relies on this dom-if being [restamp]. -->
         <template is="dom-if" if="[[showMenu]]" restamp>
-          <paper-icon-button id="menuButton" icon="cr:menu" on-tap="onMenuTap_"
+          <paper-icon-button id="menuButton" icon="cr20:menu"
+              on-tap="onMenuTap_"
               title="[[titleIfNotShowMenuPromo_(menuLabel, showMenuPromo)]]"
               aria-label$="[[menuLabel]]">
           </paper-icon-button>
           <template is="dom-if" if="[[showMenuPromo]]">
             <div id="menuPromo" role="tooltip">
               [[menuPromo]]
               <button id="closePromo" on-tap="onClosePromoTap_"
                   aria-label$="[[closeMenuPromo]]">&#x2715;</button>
             </paper-tooltip>
           </template>
@@ skipping 11 matching lines @@
       <iron-media-query query="(max-width: 900px)" query-matches="{{narrow_}}">
       </iron-media-query>
     </div>
 
     <div id="rightContent">
       <content select=".more-actions"></content>
     </div>
   </template>
   <script src="cr_toolbar.js"></script>
 </dom-module>