Remove reference counting from media::VideoDecoder and friends.

media/filters/vpx_video_decoder.h

Index: media/filters/vpx_video_decoder.h
diff --git a/media/filters/vpx_video_decoder.h b/media/filters/vpx_video_decoder.h
index 77578fdc90f7e6c82de90090cadff43857e1a886..aea47bb1455cf81c6b57bb91d57352880bf2fc16 100644
--- a/media/filters/vpx_video_decoder.h
+++ b/media/filters/vpx_video_decoder.h
@@ -6,7 +6,7 @@
 #define MEDIA_FILTERS_VPX_VIDEO_DECODER_H_
 
 #include "base/callback.h"
-#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
 #include "media/base/demuxer_stream.h"
 #include "media/base/video_decoder.h"
 
@@ -23,6 +23,7 @@ class MEDIA_EXPORT VpxVideoDecoder : public VideoDecoder {
  public:
   explicit VpxVideoDecoder(
       const scoped_refptr<base::MessageLoopProxy>& message_loop);
+  virtual ~VpxVideoDecoder();
 
   // VideoDecoder implementation.
   virtual void Initialize(const scoped_refptr<DemuxerStream>& stream,
@@ -32,9 +33,6 @@ class MEDIA_EXPORT VpxVideoDecoder : public VideoDecoder {
   virtual void Reset(const base::Closure& closure) OVERRIDE;
   virtual void Stop(const base::Closure& closure) OVERRIDE;
 
- protected:
-  virtual ~VpxVideoDecoder();
-
  private:
   enum DecoderState {
     kUninitialized,
@@ -66,6 +64,8 @@ class MEDIA_EXPORT VpxVideoDecoder : public VideoDecoder {
                       scoped_refptr<VideoFrame>* video_frame);
 
   scoped_refptr<base::MessageLoopProxy> message_loop_;
+  base::WeakPtrFactory<VpxVideoDecoder> weak_factory_;
+  base::WeakPtr<VpxVideoDecoder> weak_this_;
 
   DecoderState state_;