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

chrome/browser/speech/extension_api/tts_extension_api.cc

 // 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.
 
 #include "chrome/browser/speech/extension_api/tts_extension_api.h"
 
 #include <string>
 
 #include "base/lazy_instance.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 70 matching lines @@
 namespace extensions {
 
 // One of these is constructed for each utterance, and deleted
 // when the utterance gets any final event.
 class TtsExtensionEventHandler
     : public UtteranceEventDelegate,
       public base::SupportsWeakPtr<TtsExtensionEventHandler> {
  public:
   explicit TtsExtensionEventHandler(const std::string& src_extension_id);
 
-  virtual void OnTtsEvent(Utterance* utterance,
-                          TtsEventType event_type,
-                          int char_index,
-                          const std::string& error_message) override;
+  void OnTtsEvent(Utterance* utterance,
+                  TtsEventType event_type,
+                  int char_index,
+                  const std::string& error_message) override;
 
  private:
   // The extension ID of the extension that called speak() and should
   // receive events.
   std::string src_extension_id_;
 };
 
 TtsExtensionEventHandler::TtsExtensionEventHandler(
     const std::string& src_extension_id)
     : src_extension_id_(src_extension_id) {
@@ skipping 266 matching lines @@
 }
 
 static base::LazyInstance<BrowserContextKeyedAPIFactory<TtsAPI> > g_factory =
     LAZY_INSTANCE_INITIALIZER;
 
 BrowserContextKeyedAPIFactory<TtsAPI>* TtsAPI::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
 }  // namespace extensions