Update {virtual,override} to follow C++11 style in content.

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"
 #include "base/win/scoped_comptr.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 
 namespace content {
 class BrowserAccessibilityWin;
 
 // Manages a tree of BrowserAccessibilityWin objects.
 class CONTENT_EXPORT BrowserAccessibilityManagerWin
     : public BrowserAccessibilityManager {
  public:
   BrowserAccessibilityManagerWin(
       const ui::AXTreeUpdate& initial_tree,
       BrowserAccessibilityDelegate* delegate,
       BrowserAccessibilityFactory* factory = new BrowserAccessibilityFactory());
 
-  virtual ~BrowserAccessibilityManagerWin();
+  ~BrowserAccessibilityManagerWin() override;
 
   static ui::AXTreeUpdate GetEmptyDocument();
 
   // Get the closest containing HWND.
   HWND GetParentHWND();
 
   // The IAccessible for the parent window.
   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;
+  void OnNodeWillBeDeleted(ui::AXNode* node) override;
+  void OnNodeCreated(ui::AXNode* node) override;
 
   // BrowserAccessibilityManager methods
   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.
@@ skipping 28 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_