Move more code from headers to implementation.

media/base/pipeline_impl.h

Index: media/base/pipeline_impl.h
diff --git a/media/base/pipeline_impl.h b/media/base/pipeline_impl.h
index 32c1052d2f3e3253387fa21b3c987c4ee5bb89aa..aa99f73e1331ed22b77851351c87178c3156d188 100644
--- a/media/base/pipeline_impl.h
+++ b/media/base/pipeline_impl.h
@@ -404,14 +404,7 @@ class PipelineImpl : public Pipeline, public FilterHost {
 
   // Helper class that stores filter references during pipeline
   // initialization.
-  class PipelineInitState {
-   public:
-    scoped_refptr<DataSource> data_source_;
-    scoped_refptr<Demuxer> demuxer_;
-    scoped_refptr<AudioDecoder> audio_decoder_;
-    scoped_refptr<VideoDecoder> video_decoder_;
-  };
-
+  class PipelineInitState;
   scoped_ptr<PipelineInitState> pipeline_init_state_;
 
   FRIEND_TEST_ALL_PREFIXES(PipelineImplTest, GetBufferedTime);