Cast: Removed unnecessary ref counters.

media/cast/audio_receiver/audio_decoder.h

Index: media/cast/audio_receiver/audio_decoder.h
diff --git a/media/cast/audio_receiver/audio_decoder.h b/media/cast/audio_receiver/audio_decoder.h
index d7c6a792c13ee8765dcfa68f42f5243c7caf8163..78bb623a0118130ca22ea4ba6e6b8b70992a2f41 100644
--- a/media/cast/audio_receiver/audio_decoder.h
+++ b/media/cast/audio_receiver/audio_decoder.h
@@ -6,7 +6,7 @@
 #define MEDIA_CAST_AUDIO_RECEIVER_AUDIO_DECODER_H_
 
 #include "base/callback.h"
-#include "base/memory/ref_counted.h"
+#include "base/synchronization/lock.h"
 #include "media/cast/cast_config.h"
 #include "media/cast/rtp_common/rtp_defines.h"
 
@@ -18,9 +18,10 @@ namespace media {
 namespace cast {
 
 // Thread safe class.
-class AudioDecoder : public base::RefCountedThreadSafe<AudioDecoder> {
+class AudioDecoder {
  public:
   explicit AudioDecoder(const AudioReceiverConfig& audio_config);
+  virtual ~AudioDecoder();
 
   // Extract a raw audio frame from the decoder.
   // Set the number of desired 10ms blocks and frequency.
@@ -37,13 +38,12 @@ class AudioDecoder : public base::RefCountedThreadSafe<AudioDecoder> {
                                size_t payload_size,
                                const RtpCastHeader& rtp_header);
 
- protected:
-  virtual ~AudioDecoder();
-
  private:
-  friend class base::RefCountedThreadSafe<AudioDecoder>;
-
+  // The webrtc AudioCodingModule is threadsafe.
   scoped_ptr<webrtc::AudioCodingModule> audio_decoder_;
+  // TODO(pwestin): Refactor to avoid this. Call IncomingParsedRtpPacket from
+  // audio decoder thread that way this class does not have to be thread safe.
+  base::Lock lock_;
   bool have_received_packets_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioDecoder);