Revert r180578, r180591, and r180604 from 1410 branch.

media/filters/audio_renderer_impl.h

Index: media/filters/audio_renderer_impl.h
===================================================================
--- media/filters/audio_renderer_impl.h	(revision 182591)
+++ media/filters/audio_renderer_impl.h	(working copy)
@@ -22,7 +22,6 @@
 #include <deque>
 
 #include "base/gtest_prod_util.h"
-#include "base/memory/weak_ptr.h"
 #include "base/synchronization/lock.h"
 #include "media/base/audio_decoder.h"
 #include "media/base/audio_renderer.h"
@@ -48,7 +47,6 @@
   AudioRendererImpl(const scoped_refptr<base::MessageLoopProxy>& message_loop,
                     AudioRendererSink* sink,
                     const SetDecryptorReadyCB& set_decryptor_ready_cb);
-  virtual ~AudioRendererImpl();
 
   // AudioRenderer implementation.
   virtual void Initialize(const scoped_refptr<DemuxerStream>& stream,
@@ -82,6 +80,9 @@
     now_cb_ = now_cb;
   }
 
+ protected:
+  virtual ~AudioRendererImpl();
+
  private:
   friend class AudioRendererImplTest;
 
@@ -159,8 +160,6 @@
   void ResetDecoder(const base::Closure& callback);
 
   scoped_refptr<base::MessageLoopProxy> message_loop_;
-  base::WeakPtrFactory<AudioRendererImpl> weak_factory_;
-  base::WeakPtr<AudioRendererImpl> weak_this_;
 
   scoped_ptr<AudioSplicer> splicer_;