Standardize usage of virtual/override/final in ui/

ui/shell_dialogs/select_file_dialog.h

 // Copyright (c) 2013 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 UI_SHELL_DIALOGS_SELECT_FILE_DIALOG_H_
 #define UI_SHELL_DIALOGS_SELECT_FILE_DIALOG_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 160 matching lines @@
                   gfx::NativeWindow owning_window,
                   void* params);
   bool HasMultipleFileTypeChoices();
 
   // Sets the global ShellDialogsDelegate. Defaults to NULL.
   static void SetShellDialogsDelegate(ShellDialogsDelegate* delegate);
 
  protected:
   friend class base::RefCountedThreadSafe<SelectFileDialog>;
   explicit SelectFileDialog(Listener* listener, SelectFilePolicy* policy);
-  virtual ~SelectFileDialog();
+  ~SelectFileDialog() override;
 
   // Displays the actual file-selection dialog.
   // This is overridden in the platform-specific descendants of FileSelectDialog
   // and gets called from SelectFile after testing the
   // AllowFileSelectionDialogs-Policy.
   virtual void SelectFileImpl(
       Type type,
       const base::string16& title,
       const base::FilePath& default_path,
       const FileTypeInfo* file_types,
@@ skipping 22 matching lines @@
   virtual bool HasMultipleFileTypeChoicesImpl() = 0;
 
   scoped_ptr<SelectFilePolicy> select_file_policy_;
 
   DISALLOW_COPY_AND_ASSIGN(SelectFileDialog);
 };
 
 }  // namespace ui
 
 #endif  // UI_SHELL_DIALOGS_SELECT_FILE_DIALOG_H_