[MD WebUI] Move icons used in Bookmarks and Settings to shared file.

chrome/browser/resources/settings/search_page/search_page.html

 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/md_select_css.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
+<link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="/controls/extension_controlled_indicator.html">
 <link rel="import" href="/controls/settings_checkbox.html">
-<link rel="import" href="/icons.html">
 <link rel="import" href="/i18n_setup.html">
 <link rel="import" href="/route.html">
 <link rel="import" href="/search_engines_page/search_engines_page.html">
 <link rel="import" href="/search_engines_page/search_engines_browser_proxy.html">
 <link rel="import" href="/settings_page/settings_animated_pages.html">
 <link rel="import" href="/settings_page/settings_subpage.html">
 <link rel="import" href="/settings_shared_css.html">
 <link rel="import" href="/settings_vars_css.html">
 
 <dom-module id="settings-search-page">
@@ skipping 73 matching lines @@
               <paper-button on-tap="onRetrainTap_" class="secondary-button">
                 $i18n{searchOkGoogleRetrain}
               </paper-button>
             </div>
           </div>
 
           <template is="dom-if"
               if="[[getShowHotwordError_(hotwordInfo_.*,
                   hotwordSearchEnablePref_)]]">
             <div class="settings-box continuation indented">
-              <iron-icon icon="settings:warning"></iron-icon>
+              <iron-icon icon="cr:warning"></iron-icon>
               <div inner-h-t-m-l="[[hotwordInfo_.errorMessage]]"></div>
             </div>
           </template>
 
           <template is="dom-if" if="[[hotwordInfo_.historyEnabled]]">
             <div class="settings-box two-line continuation indented"
                 on-tap="onManageAudioHistoryTap_" actionable>
               <div class="start">
                 <div>
                   [[i18n('searchOkGoogleAudioHistoryLabel',
@@ skipping 25 matching lines @@
         <settings-subpage
             associated-control="[[$$('#subpage-trigger')]]"
             page-title="$i18n{searchEnginesManage}">
           <settings-search-engines-page></settings-search-engines-page>
         </settings-subpage>
       </template>
     </settings-animated-pages>
   </template>
   <script src="search_page.js"></script>
 </dom-module>