MD History: fix typo and dialog inheritance

chrome/browser/resources/md_history/list_container.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_dialog/cr_dialog.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_shared_menu/cr_shared_menu.html">
 <link rel="import" href="chrome://resources/cr_elements/shared_style_css.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-pages/iron-pages.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-item/paper-item.html">
 <link rel="import" href="chrome://history/grouped_list.html">
 <link rel="import" href="chrome://history/history_list.html">
 
 <dom-module id="history-list-container">
@@ skipping 28 matching lines @@
       <template is="dom-if" if="[[grouped]]">
         <history-grouped-list id="grouped-list"
             range="[[queryState.range]]"
             query-start-time="[[queryResult.info.queryStartTime]]"
             query-end-time="[[queryResult.info.queryEndTime]]"
             searched-term="[[queryResult.info.term]]">
         </history-grouped-list>
       </template>
     </iron-pages>
 
-    <dialog is"cr-dialog" id="dialog">
+    <dialog is="cr-dialog" id="dialog">
       <div class="title">$i18n{removeSelected}</div>
       <div class="body">$i18n{deleteWarning}</div>
       <div class="button-container">
         <paper-button class="cancel-button" on-tap="onDialogCancelTap_">
           $i18n{cancel}
         </paper-button>
         <paper-button class="action-button" on-tap="onDialogConfirmTap_"
             autofocus>
           $i18n{deleteConfirm}
         </paper-button>
       </div>
     </dialog>
 
     <cr-shared-menu id="sharedMenu">
       <paper-item id="menuMoreButton" on-tap="onMoreFromSiteTap_">
         $i18n{moreFromSite}
       </paper-item>
       <paper-item id="menuRemoveButton" on-tap="onRemoveFromHistoryTap_">
         $i18n{removeFromHistory}
       </paper-item>
     </cr-shared-menu>
   </template>
   <script src="chrome://history/list_container.js"></script>
 </dom-module>