Fix SpeechUIModel lifetime issue in Chrome's AppListViewDelegate when switching profiles

ui/app_list/speech_ui_model.h

 // 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.
 
 #ifndef UI_APP_LIST_SPEECH_UI_MODEL_H_
 #define UI_APP_LIST_SPEECH_UI_MODEL_H_
 
 #include "base/basictypes.h"
 #include "base/observer_list.h"
 #include "base/strings/string16.h"
 #include "ui/app_list/app_list_export.h"
 #include "ui/app_list/speech_ui_model_observer.h"
 #include "ui/gfx/image/image_skia.h"
 
 namespace app_list {
 
 // SpeechUIModel provides the interface to update the UI for speech recognition.
 class APP_LIST_EXPORT SpeechUIModel {
  public:
-  explicit SpeechUIModel(SpeechRecognitionState initial_state);
+  // Construct the model, initially in state SPEECH_RECOGNITION_OFF.
+  SpeechUIModel();
   virtual ~SpeechUIModel();
 
   void SetSpeechResult(const base::string16& result, bool is_final);
   void UpdateSoundLevel(int16 level);
   void SetSpeechRecognitionState(SpeechRecognitionState new_state);
 
   void AddObserver(SpeechUIModelObserver* observer);
   void RemoveObserver(SpeechUIModelObserver* observer);
 
   const base::string16& result() const { return result_; }
@@ skipping 17 matching lines @@
   int16 maximum_sound_level_;
 
   ObserverList<SpeechUIModelObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(SpeechUIModel);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_SPEECH_UI_MODEL_H_