Convert string16 to base::string16 in content.

content/public/browser/speech_recognition_manager.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 CONTENT_PUBLIC_BROWSER_SPEECH_RECOGNITION_MANAGER_H_
 #define CONTENT_PUBLIC_BROWSER_SPEECH_RECOGNITION_MANAGER_H_
 
 #include "base/callback.h"
 #include "base/strings/string16.h"
 #include "content/common/content_export.h"
@@ skipping 62 matching lines @@
   // {render_view_id, render_view_id, request_id}.
   virtual int GetSession(int render_process_id,
                          int render_view_id,
                          int request_id) const = 0;
 
   // Returns true if the OS reports existence of audio recording devices.
   virtual bool HasAudioInputDevices() = 0;
 
   // Returns a human readable string for the model/make of the active audio
   // input device for this computer.
-  virtual string16 GetAudioInputDeviceModel() = 0;
+  virtual base::string16 GetAudioInputDeviceModel() = 0;
 
   // Invokes the platform provided microphone settings UI in a non-blocking way,
   // via the BrowserThread::FILE thread.
   virtual void ShowAudioInputSettings() = 0;
 
  protected:
   virtual ~SpeechRecognitionManager() {}
 
  private:
   static SpeechRecognitionManager* manager_for_tests_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_SPEECH_RECOGNITION_MANAGER_H_