First patch in making destructors of refcounted objects private.

media/audio/linux/alsa_output.h

Index: media/audio/linux/alsa_output.h
===================================================================
--- media/audio/linux/alsa_output.h	(revision 30973)
+++ media/audio/linux/alsa_output.h	(working copy)
@@ -75,7 +75,6 @@
                       AlsaWrapper* wrapper,
                       AudioManagerLinux* manager,
                       MessageLoop* message_loop);
-  virtual ~AlsaPcmOutputStream();
 
   // Implementation of AudioOutputStream.
   virtual bool Open(size_t packet_size);
@@ -86,6 +85,7 @@
   virtual void GetVolume(double* left_level, double* right_level);
 
  private:
+  friend class base::RefCountedThreadSafe<AlsaPcmOutputStream>;
   friend class AlsaPcmOutputStreamTest;
   FRIEND_TEST(AlsaPcmOutputStreamTest, AutoSelectDevice_DeviceSelect);
   FRIEND_TEST(AlsaPcmOutputStreamTest, AutoSelectDevice_FallbackDevices);
@@ -106,6 +106,8 @@
   FRIEND_TEST(AlsaPcmOutputStreamTest, WritePacket_StopStream);
   FRIEND_TEST(AlsaPcmOutputStreamTest, WritePacket_WriteFails);
 
+  virtual ~AlsaPcmOutputStream();
+
   // In-memory buffer to hold sound samples before pushing to the sound device.
   // TODO(ajwong): There are now about 3 buffer/packet implementations. Factor
   // them out.