[MD settings] change menu and domain icons

chrome/browser/resources/settings/about_page/detailed_build_info.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="about_page_browser_proxy.html">
 <link rel="import" href="channel_switcher_dialog.html">
 <link rel="import" href="../i18n_setup.html">
 <link rel="import" href="../settings_shared_css.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.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-button/paper-button.html">
 
@@ skipping 27 matching lines @@
     <div class="settings-box two-line">
       <div class="start">
         <div>$i18n{aboutChannelLabel}</div>
         <div class="secondary">[[currentlyOnChannelText_]]</div>
       </div>
       <div class="secondary-action">
         <paper-button on-tap="onChangeChannelTap_"
             disabled="[[!canChangeChannel_]]">
           $i18n{aboutChangeChannel}
         </paper-button>
-        <iron-icon icon="cr:domain" hidden="[[canChangeChannel_]]"</iron-icon>
+        <iron-icon icon="cr20:domain" hidden="[[canChangeChannel_]]"</iron-icon>
       </div>
       <template is="dom-if" if="[[showChannelSwitcherDialog_]]" restamp>
         <settings-channel-switcher-dialog></settings-channel-switcher-dialog>
       </template>
     </div>
     <div class="settings-box two-line single-column"
         hidden$="[[!shouldShowVersion_(versionInfo_.arcVersion)]]">
       <div>$i18n{aboutArcVersionLabel}</div>
       <div class="secondary" id="arcVersion">[[versionInfo_.arcVersion]]</div>
     </div>
@@ skipping 13 matching lines @@
       <div>$i18n{aboutCommandLineLabel}</div>
       <div id="command-line" class="secondary">$i18n{aboutCommandLine}</div>
     </div>
     <div class="settings-box two-line single-column">
       <div>$i18n{aboutBuildDateLabel}</div>
       <div class="secondary">$i18n{aboutBuildDate}</div>
     </div>
   </template>
   <script src="detailed_build_info.js"></script>
 </dom-module>