Stop utterances from a tab when that tab is closed.

chrome/browser/speech/tts_controller_impl.h

 // Copyright 2014 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_TTS_CONTROLLER_IMPL_H_
 #define CHROME_BROWSER_SPEECH_TTS_CONTROLLER_IMPL_H_
 
 #include <queue>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
-#include "base/memory/weak_ptr.h"
 #include "chrome/browser/speech/tts_controller.h"
 #include "url/gurl.h"
 
 namespace content {
 class BrowserContext;
 }
 
 // Singleton class that manages text-to-speech for the TTS and TTS engine
 // extension APIs, maintaining a queue of pending utterances and keeping
 // track of all state.
@@ skipping 10 matching lines @@
   void Resume() override;
   void OnTtsEvent(int utterance_id,
                   TtsEventType event_type,
                   int char_index,
                   const std::string& error_message) override;
   void GetVoices(content::BrowserContext* browser_context,
                  std::vector<VoiceData>* out_voices) override;
   void VoicesChanged() override;
   void AddVoicesChangedDelegate(VoicesChangedDelegate* delegate) override;
   void RemoveVoicesChangedDelegate(VoicesChangedDelegate* delegate) override;
+  void RemoveUtteranceEventDelegate(UtteranceEventDelegate* delegate) override;
   void SetTtsEngineDelegate(TtsEngineDelegate* delegate) override;
   TtsEngineDelegate* GetTtsEngineDelegate() override;
   void SetPlatformImpl(TtsPlatformImpl* platform_impl) override;
   int QueueSize() override;
 
  protected:
   TtsControllerImpl();
   ~TtsControllerImpl() override;
 
  private:
@@ skipping 37 matching lines @@
   // dependency injection.
   TtsPlatformImpl* platform_impl_;
 
   // The delegate that processes TTS requests with user-installed extensions.
   TtsEngineDelegate* tts_engine_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(TtsControllerImpl);
 };
 
 #endif  // CHROME_BROWSER_SPEECH_TTS_CONTROLLER_IMPL_H_