MD History: focus REMOVE button by default in multi-delete dialog

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_lazy_render/cr_lazy_render.html">
 <link rel="import" href="chrome://resources/cr_elements/shared_style_css.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-a11y-announcer/iron-a11y-announcer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-pages/iron-pages.html">
 <link rel="import" href="chrome://history/browser_service.html">
 <link rel="import" href="chrome://history/history_list.html">
 <link rel="import" href="chrome://history/shared_style.html">
 
 <!-- Lazy loaded: cr-dialog, cr-shared-menu, history-grouped-list, paper-button,
@@ skipping 32 matching lines @@
     </iron-pages>
 
     <template is="cr-lazy-render" id="dialog">
       <dialog is="cr-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>
+          <paper-button class="action-button" on-tap="onDialogConfirmTap_">
             $i18n{deleteConfirm}
           </paper-button>
         </div>
       </dialog>
     </template>
 
     <template is="cr-lazy-render" id="sharedMenu">
       <cr-shared-menu>
         <paper-item id="menuMoreButton" class="menu-item"
             on-tap="onMoreFromSiteTap_">
           $i18n{moreFromSite}
         </paper-item>
         <paper-item id="menuRemoveButton" class="menu-item"
             on-tap="onRemoveFromHistoryTap_">
           $i18n{removeFromHistory}
         </paper-item>
       </cr-shared-menu>
     </template>
   </template>
   <script src="chrome://history/list_container.js"></script>
 </dom-module>