More header cleanup:

media/base/pipeline_impl.h

 // Copyright (c) 2010 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.
 
 #ifndef MEDIA_BASE_PIPELINE_IMPL_H_
 #define MEDIA_BASE_PIPELINE_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/message_loop.h"
 #include "base/ref_counted.h"
+#include "base/scoped_ptr.h"
 #include "base/thread.h"
 #include "base/time.h"
 #include "media/base/clock_impl.h"
 #include "media/base/filter_host.h"
 #include "media/base/pipeline.h"
 #include "testing/gtest/include/gtest/gtest_prod.h"
 
 namespace media {
 
 
@@ skipping 387 matching lines @@
   typedef std::vector<base::Thread*> FilterThreadVector;
   FilterThreadVector filter_threads_;
 
   FRIEND_TEST(PipelineImplTest, GetBufferedTime);
   DISALLOW_COPY_AND_ASSIGN(PipelineImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_IMPL_H_