RefCounted types should not have public destructors, content/browser part 2

content/renderer/media/video_capture_impl_manager.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
 // VideoCaptureImplManager manages video capture devices in renderer process.
 // The video capture clients use AddDevice() to get a pointer to
 // video capture device. VideoCaputreImplManager supports multiple clients
 // accessing same device.
 
 #ifndef CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_MANAGER_H_
 #define CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_MANAGER_H_
 
 #include <list>
 #include <map>
 
 #include "base/threading/thread.h"
 #include "base/message_loop_proxy.h"
 #include "base/synchronization/lock.h"
 #include "content/common/content_export.h"
 #include "media/video/capture/video_capture.h"
 
 class VideoCaptureImpl;
 class VideoCaptureMessageFilter;
 
 class CONTENT_EXPORT VideoCaptureImplManager
     : public base::RefCountedThreadSafe<VideoCaptureImplManager> {
  public:
   VideoCaptureImplManager();
-  virtual ~VideoCaptureImplManager();
 
   // Called by video capture client |handler| to add device referenced
   // by |id| to VideoCaptureImplManager's list of opened device list.
   // A pointer to VideoCapture is returned to client so that client can
   // operate on that pointer, such as StartCaptrue, StopCapture.
   virtual media::VideoCapture* AddDevice(
       media::VideoCaptureSessionId id,
       media::VideoCapture::EventHandler* handler);
 
   // Called by video capture client |handler| to remove device referenced
   // by |id| from VideoCaptureImplManager's list of opened device list.
   virtual void RemoveDevice(media::VideoCaptureSessionId id,
                             media::VideoCapture::EventHandler* handler);
 
   VideoCaptureMessageFilter* video_capture_message_filter() const {
     return filter_;
   }
 
+ protected:
+  virtual ~VideoCaptureImplManager();
+
  private:
+  friend class base::RefCountedThreadSafe<VideoCaptureImplManager>;
+
   struct Device {
     Device(VideoCaptureImpl* device,
            media::VideoCapture::EventHandler* handler);
     ~Device();
 
     VideoCaptureImpl* vc;
     std::list<media::VideoCapture::EventHandler*> clients;
   };
 
   void FreeDevice(VideoCaptureImpl* vc);
 
   typedef std::map<media::VideoCaptureSessionId, Device*> Devices;
   Devices devices_;
   base::Lock lock_;
   scoped_refptr<VideoCaptureMessageFilter> filter_;
   base::Thread thread_;
   scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureImplManager);
 };
 
 #endif  // CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_MANAGER_H_