Standardize usage of virtual/override/final in components/

components/web_modal/web_contents_modal_dialog_host.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 COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_HOST_H_
 #define COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_HOST_H_
 
 #include "components/web_modal/modal_dialog_host.h"
 
 namespace gfx {
 class Size;
 }
 
 namespace web_modal {
 
 // Unlike browser modal dialogs, web contents modal dialogs should not be able
 // to draw outside the browser window. WebContentsModalDialogHost adds a
 // GetMaximumDialogSize method in order for positioning code to be able to take
 // this into account.
 class WebContentsModalDialogHost : public ModalDialogHost {
  public:
-  virtual ~WebContentsModalDialogHost();
+  ~WebContentsModalDialogHost() override;
 
   // Returns the maximum dimensions a dialog can have.
   virtual gfx::Size GetMaximumDialogSize() = 0;
 };
 
 }  // namespace web_modal
 
 #endif  // COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_HOST_H_