MD History: Only load needed paper-icon-buttons instead of whole set of icons

chrome/browser/resources/md_history/history_toolbar.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-flex-layout/iron-flex-layout.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.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-spinner/paper-spinner.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_search_field/cr_search_field.html">
 <link rel="import" href="chrome://history/shared_style.html">
 
 <dom-module id="history-toolbar">
   <template>
@@ skipping 95 matching lines @@
             </paper-spinner>
             <cr-search-field id="search-input" label="$i18n{search}"
                 clear-label="$i18n{clearSearch}">
             </cr-search-field>
           </div>
         </div>
       </div>
 
       <div id="overlay-wrapper" hidden$="[[!itemsSelected_]]">
         <div id="overlay-buttons">
-          <paper-icon-button icon="clear" id="cancel-icon-button"
+          <paper-icon-button icon="cr:clear" id="cancel-icon-button"
               on-tap="onClearSelectionTap_"></paper-icon-button>
           <div id="number-selected">[[numberOfItemsSelected_(count)]]</div>
           <paper-button id="cancel-button" on-tap="onClearSelectionTap_">
             $i18n{cancel}
           </paper-button>
           <paper-button id="delete-button" on-tap="onDeleteTap_">
             $i18n{delete}
           </paper-button>
         </div>
       </div>
     </div>
   </template>
   <script src="chrome://history/history_toolbar.js"></script>
 </dom-module>