Take advantage of the new Pass() machinery on scoped_ptr{,_malloc}.

media/base/filter_factories.h

 // Copyright (c) 2011 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.
 
 #ifndef MEDIA_BASE_FILTER_FACTORIES_H_
 #define MEDIA_BASE_FILTER_FACTORIES_H_
 
 #include<string>
 
 #include "base/callback.h"
@@ skipping 10 matching lines @@
   // Ownership of the DataSource is transferred through this callback.
   typedef base::Callback<void(PipelineStatus, DataSource*)> BuildCallback;
 
   virtual ~DataSourceFactory();
 
   // Builds a DataSource for |url| and returns it via |callback|.
   virtual void Build(const std::string& url, const BuildCallback& callback) = 0;
 
   // Makes a copy of this factory.
   // NOTE: Pending requests are not cloned.
-  virtual DataSourceFactory* Clone() const = 0;
+  virtual scoped_ptr<DataSourceFactory> Clone() const = 0;
 };
 
 class Demuxer;
 
 // Asynchronous factory interface for building Demuxer objects.
 class MEDIA_EXPORT DemuxerFactory {
  public:
   // Ownership of the Demuxer is transferred through this callback.
   typedef base::Callback<void(PipelineStatus, Demuxer*)> BuildCallback;
 
   virtual ~DemuxerFactory();
 
   // Builds a Demuxer for |url| and returns it via |callback|.
   virtual void Build(const std::string& url, const BuildCallback& callback) = 0;
 
   // Makes a copy of this factory.
   // NOTE: Pending requests are not cloned.
-  virtual DemuxerFactory* Clone() const = 0;
+  virtual scoped_ptr<DemuxerFactory> Clone() const = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_FILTER_FACTORIES_H_