Suppress accessibility events when user is navigating away.

content/browser/accessibility/browser_accessibility_manager_win.h

 // 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.
 
 #ifndef CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_
 
 #include <oleacc.h>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 23 matching lines @@
   IAccessible* GetParentIAccessible();
 
   // Calls NotifyWinEvent if the parent window's IAccessible pointer is known.
   void MaybeCallNotifyWinEvent(DWORD event, BrowserAccessibility* node);
 
   // AXTree methods
   virtual void OnNodeWillBeDeleted(ui::AXNode* node) override;
   virtual void OnNodeCreated(ui::AXNode* node) override;
 
   // BrowserAccessibilityManager methods
-  virtual void OnWindowFocused() override;
-  virtual void NotifyAccessibilityEvent(
+  void OnWindowFocused() override;
+  void UserIsReloading() override;
+  void NotifyAccessibilityEvent(
       ui::AXEvent event_type, BrowserAccessibility* node) override;
 
   // Track this object and post a VISIBLE_DATA_CHANGED notification when
   // its container scrolls.
   // TODO(dmazzoni): remove once http://crbug.com/113483 is fixed.
   void TrackScrollingObject(BrowserAccessibilityWin* node);
 
   // Return a pointer to the object corresponding to the given windows-specific
   // unique id, does not make a new reference.
   BrowserAccessibilityWin* GetFromUniqueIdWin(LONG unique_id_win);
@@ skipping 23 matching lines @@
   // Set to true if we need to fire a focus event on the root as soon as
   // possible.
   bool focus_event_on_root_needed_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManagerWin);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_WIN_H_