Making DesktopEnvironment a factory class used by ClientSession to create audio/video capturers and…

remoting/host/ipc_audio_capturer.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 REMOTING_HOST_IPC_AUDIO_CAPTURER_H_
 #define REMOTING_HOST_IPC_AUDIO_CAPTURER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "remoting/host/audio_capturer.h"
 
 namespace remoting {
 
 class AudioPacket;
 class DesktopSessionProxy;
 
 class IpcAudioCapturer : public AudioCapturer {
  public:
-  IpcAudioCapturer(scoped_refptr<DesktopSessionProxy> desktop_session_proxy);
+  explicit IpcAudioCapturer(
+      scoped_refptr<DesktopSessionProxy> desktop_session_proxy);
   virtual ~IpcAudioCapturer();
 
   // AudioCapturer interface.
   virtual bool Start(const PacketCapturedCallback& callback) OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual bool IsStarted() OVERRIDE;
 
   // Called by DesktopSessionProxy when an audio packet was received.
   void OnAudioPacket(scoped_ptr<AudioPacket> packet);
 
  private:
   // Invoked when an audio packet was received.
   PacketCapturedCallback callback_;
 
   // Wraps the IPC channel to the desktop session agent.
   scoped_refptr<DesktopSessionProxy> desktop_session_proxy_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(IpcAudioCapturer);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_IPC_AUDIO_CAPTURER_H_