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

media/base/pipeline_impl.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.
 
 // Implementation of Pipeline & PipelineStatusNotification (an async-to-sync
 // callback adapter).
 
 #ifndef MEDIA_BASE_PIPELINE_IMPL_H_
 #define MEDIA_BASE_PIPELINE_IMPL_H_
 
@@ skipping 89 matching lines @@
     : public Pipeline,
       public FilterHost,
       public DemuxerHost {
  public:
   explicit PipelineImpl(MessageLoop* message_loop, MediaLog* media_log);
 
   // Pipeline implementation.
   virtual void Init(const PipelineStatusCB& ended_callback,
                     const PipelineStatusCB& error_callback,
                     const NetworkEventCB& network_callback) OVERRIDE;
-  virtual bool Start(FilterCollection* filter_collection,
+  virtual bool Start(scoped_ptr<FilterCollection> filter_collection,
                      const std::string& uri,
                      const PipelineStatusCB& start_callback) OVERRIDE;
   virtual void Stop(const PipelineStatusCB& stop_callback) OVERRIDE;
   virtual void Seek(base::TimeDelta time,
                     const PipelineStatusCB& seek_callback) OVERRIDE;
   virtual bool IsRunning() const OVERRIDE;
   virtual bool IsInitialized() const OVERRIDE;
   virtual bool HasAudio() const OVERRIDE;
   virtual bool HasVideo() const OVERRIDE;
   virtual float GetPlaybackRate() const OVERRIDE;
@@ skipping 103 matching lines @@
 
   // Callback executed by filters when completing teardown operations.
   void OnTeardownStateTransition();
 
   // Callback executed by filters to update statistics.
   void OnUpdateStatistics(const PipelineStatistics& stats);
 
   // The following "task" methods correspond to the public methods, but these
   // methods are run as the result of posting a task to the PipelineInternal's
   // message loop.
-  void StartTask(FilterCollection* filter_collection,
+  void StartTask(scoped_ptr<FilterCollection> filter_collection,
                  const std::string& url,
                  const PipelineStatusCB& start_callback);
 
   // InitializeTask() performs initialization in multiple passes. It is executed
   // as a result of calling Start() or InitializationComplete() that advances
   // initialization to the next state. It works as a hub of state transition for
   // initialization.  One stage communicates its status to the next through
   // |last_stage_status|.
   void InitializeTask(PipelineStatus last_stage_status);
 
@@ skipping 256 matching lines @@
   bool is_downloading_data_;
 
   FRIEND_TEST_ALL_PREFIXES(PipelineImplTest, GetBufferedTime);
 
   DISALLOW_COPY_AND_ASSIGN(PipelineImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_IMPL_H_