history: fix focus regression when showing "Remove history" confirmation dialog.

chrome/browser/resources/history/history.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 <include src="../uber/uber_utils.js">
 <include src="history_focus_manager.js">
 
 ///////////////////////////////////////////////////////////////////////////////
 // Globals:
 /** @const */ var RESULTS_PER_PAGE = 150;
@@ skipping 1957 matching lines @@
   recordUmaAction('HistoryPage_InitClearBrowsingData');
   chrome.send('clearBrowsingData');
 }
 
 /**
  * Shows the dialog for the user to confirm removal of selected history entries.
  */
 function showConfirmationOverlay() {
   $('alertOverlay').classList.add('showing');
   $('overlay').hidden = false;
+  $('history-page').setAttribute('aria-hidden', 'true');
   uber.invokeMethodOnParent('beginInterceptingEvents');
+
+  // If an element is focused behind the confirm overlay, blur it so focus
+  // doesn't accidentally get stuck behind it.
+  if ($('history-page').contains(document.activeElement))
+    document.activeElement.blur();
 }
 
 /**
  * Hides the confirmation overlay used to confirm selected history entries.
  */
 function hideConfirmationOverlay() {
   $('alertOverlay').classList.remove('showing');
   $('overlay').hidden = true;
+  $('history-page').removeAttribute('aria-hidden');
   uber.invokeMethodOnParent('stopInterceptingEvents');
 }
 
 /**
  * Shows the confirmation alert for history deletions and permits browser tests
  * to override the dialog.
  * @param {function()=} okCallback A function to be called when the user presses
  *     the ok button.
  * @param {function()=} cancelCallback A function to be called when the user
  *     presses the cancel button.
  */
 function confirmDeletion(okCallback, cancelCallback) {
   alertOverlay.setValues(
       loadTimeData.getString('removeSelected'),
       loadTimeData.getString('deleteWarning'),
+      loadTimeData.getString('deleteConfirm'),
       loadTimeData.getString('cancel'),
-      loadTimeData.getString('deleteConfirm'),
-      cancelCallback,
-      okCallback);
+      okCallback,
+      cancelCallback);
   showConfirmationOverlay();
 }
 
 /**
  * Click handler for the 'Remove selected items' button.
  * Confirms the deletion with the user, and then deletes the selected visits.
  */
 function removeItems() {
   recordUmaAction('HistoryPage_RemoveSelected');
   if (!loadTimeData.getBoolean('allowDeletingHistory'))
@@ skipping 250 matching lines @@
     historyView.reload();
 }
 
 // Add handlers to HTML elements.
 document.addEventListener('DOMContentLoaded', load);
 
 // This event lets us enable and disable menu items before the menu is shown.
 document.addEventListener('canExecute', function(e) {
   e.canExecute = true;
 });