Drive extension functions from ExtensionFunction::Run. The

chrome/browser/speech/extension_api/tts_extension_api.h

 // 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.
 
 #ifndef CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_EXTENSION_API_H_
 #define CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_EXTENSION_API_H_
 
 #include <string>
 
 #include "chrome/browser/extensions/chrome_extension_function.h"
 #include "chrome/browser/speech/tts_controller.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
 
 namespace content {
 class BrowserContext;
 }
 
 const char *TtsEventTypeToString(TtsEventType event_type);
 TtsEventType TtsEventTypeFromString(const std::string& str);
 
 namespace extensions {
 
 class TtsSpeakFunction : public ChromeAsyncExtensionFunction {
  private:
   virtual ~TtsSpeakFunction() {}
-  virtual bool RunImpl() OVERRIDE;
+  virtual bool RunAsync() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION("tts.speak", TTS_SPEAK)
 };
 
 class TtsStopSpeakingFunction : public ChromeSyncExtensionFunction {
  private:
   virtual ~TtsStopSpeakingFunction() {}
   virtual bool RunSync() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION("tts.stop", TTS_STOP)
 };
 
@@ skipping 39 matching lines @@
   // BrowserContextKeyedAPI implementation.
   static const char* service_name() {
     return "TtsAPI";
   }
   static const bool kServiceIsNULLWhileTesting = true;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_EXTENSION_API_H_