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

chrome/browser/extensions/api/braille_display_private/braille_display_private_api.cc

 // Copyright 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.
 
 #include "chrome/browser/extensions/api/braille_display_private/braille_display_private_api.h"
 
 #include "base/lazy_instance.h"
 #include "base/profiler/scoped_profile.h"
 #include "chrome/browser/extensions/api/braille_display_private/braille_controller.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 11 matching lines @@
 using extensions::api::braille_display_private::DisplayState;
 using extensions::api::braille_display_private::KeyEvent;
 using extensions::api::braille_display_private::BrailleController;
 
 namespace extensions {
 
 class BrailleDisplayPrivateAPI::DefaultEventDelegate
     : public BrailleDisplayPrivateAPI::EventDelegate {
  public:
   DefaultEventDelegate(EventRouter::Observer* observer, Profile* profile);
-  virtual ~DefaultEventDelegate();
+  ~DefaultEventDelegate() override;
 
-  virtual void BroadcastEvent(scoped_ptr<Event> event) override;
-  virtual bool HasListener() override;
+  void BroadcastEvent(scoped_ptr<Event> event) override;
+  bool HasListener() override;
 
  private:
   EventRouter::Observer* observer_;
   Profile* profile_;
 };
 
 BrailleDisplayPrivateAPI::BrailleDisplayPrivateAPI(
     content::BrowserContext* context)
     : profile_(Profile::FromBrowserContext(context)),
       scoped_observer_(this),
@@ skipping 130 matching lines @@
 
 void BrailleDisplayPrivateWriteDotsFunction::Work() {
   BrailleController::GetInstance()->WriteDots(params_->cells);
 }
 
 bool BrailleDisplayPrivateWriteDotsFunction::Respond() {
   return true;
 }
 }  // namespace api
 }  // namespace extensions