Standardize usage of virtual/override/final in chrome/browser/ui/

chrome/browser/ui/cocoa/tab_modal_confirm_dialog_mac.h

 // Copyright (c) 2011 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 CHROME_BROWSER_UI_COCOA_TAB_MODAL_CONFIRM_DIALOG_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_TAB_MODAL_CONFIRM_DIALOG_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 14 matching lines @@
 // To display the dialog, allocate this object on the heap. It will open the
 // dialog from its constructor and then delete itself when the user dismisses
 // the dialog.
 class TabModalConfirmDialogMac : public TabModalConfirmDialog,
                                  public ConstrainedWindowMacDelegate {
  public:
   TabModalConfirmDialogMac(TabModalConfirmDialogDelegate* delegate,
                            content::WebContents* web_contents);
 
  private:
-  virtual ~TabModalConfirmDialogMac();
+  ~TabModalConfirmDialogMac() override;
 
   // TabModalConfirmDialog:
-  virtual void AcceptTabModalDialog() override;
-  virtual void CancelTabModalDialog() override;
+  void AcceptTabModalDialog() override;
+  void CancelTabModalDialog() override;
 
   // TabModalConfirmDialogCloseDelegate:
-  virtual void CloseDialog() override;
+  void CloseDialog() override;
 
   // ConstrainedWindowMacDelegate:
-  virtual void OnConstrainedWindowClosed(
-      ConstrainedWindowMac* window) override;
+  void OnConstrainedWindowClosed(ConstrainedWindowMac* window) override;
 
   bool closing_;
 
   scoped_ptr<ConstrainedWindowMac> window_;
   scoped_ptr<TabModalConfirmDialogDelegate> delegate_;
   base::scoped_nsobject<ConstrainedWindowAlert> alert_;
   base::scoped_nsobject<TabModalConfirmDialogMacBridge> bridge_;
 
   DISALLOW_COPY_AND_ASSIGN(TabModalConfirmDialogMac);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_TAB_MODAL_CONFIRM_DIALOG_MAC_H_