Move Pipeline permanent callbacks into Pipeline::Client interface.

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 7a6da3a7b5115974ad31e0ddf7066c0b53b1a4b4..424331effd7e5f26f19b9b15df42c958af723f9a 100644
--- a/media/base/pipeline_impl.h
+++ b/media/base/pipeline_impl.h
@@ -75,7 +75,8 @@ class TextRenderer;
 class MEDIA_EXPORT PipelineImpl : public Pipeline, public DemuxerHost {
  public:
   // Constructs a media pipeline that will execute on |task_runner|.
-  PipelineImpl(const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
+  PipelineImpl(PipelineClient* client,
+               const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
                MediaLog* media_log);
   ~PipelineImpl() override;