Migrate Pipeline & PipelineImpl to PipelineStatusCB.

media/filters/ffmpeg_demuxer.h

Index: media/filters/ffmpeg_demuxer.h
diff --git a/media/filters/ffmpeg_demuxer.h b/media/filters/ffmpeg_demuxer.h
index 4ab76902c53dff6120c048d979645e63f47da35a..6d6abbd59fe3ae0e1d54072e01e11365111a0230 100644
--- a/media/filters/ffmpeg_demuxer.h
+++ b/media/filters/ffmpeg_demuxer.h
@@ -134,7 +134,7 @@ class FFmpegDemuxer : public Demuxer, public FFmpegURLProtocol {
   virtual void PostDemuxTask();
 
   void Initialize(
-      DataSource* data_source, PipelineStatusCallback* callback);
+      DataSource* data_source, const PipelineStatusCB& callback);
 
   // Filter implementation.
   virtual void Stop(FilterCallback* callback);
@@ -168,7 +168,7 @@ class FFmpegDemuxer : public Demuxer, public FFmpegURLProtocol {
 
   // Carries out initialization on the demuxer thread.
   void InitializeTask(
-      DataSource* data_source, PipelineStatusCallback* callback);
+      DataSource* data_source, const PipelineStatusCB& callback);
 
   // Carries out a seek on the demuxer thread.
   void SeekTask(base::TimeDelta time, const FilterStatusCB& cb);