Remove reference counting from media::Demuxer and friends.

media/filters/pipeline_integration_test_base.cc

Index: media/filters/pipeline_integration_test_base.cc
diff --git a/media/filters/pipeline_integration_test_base.cc b/media/filters/pipeline_integration_test_base.cc
index 0be9861ec325782a0025d85874a071673b912d11..c138afb0816d4ca2f5312e41886200be547aee56 100644
--- a/media/filters/pipeline_integration_test_base.cc
+++ b/media/filters/pipeline_integration_test_base.cc
@@ -210,19 +210,19 @@ PipelineIntegrationTestBase::CreateFilterCollection(
   media::FFmpegNeedKeyCB need_key_cb =
       base::Bind(&PipelineIntegrationTestBase::DemuxerNeedKeyCB,
                  base::Unretained(this));
-  return CreateFilterCollection(
-      new FFmpegDemuxer(message_loop_.message_loop_proxy(),
-                        data_source,
-                        need_key_cb),
-      decryptor);
+  scoped_ptr<Demuxer> demuxer(new FFmpegDemuxer(
+      message_loop_.message_loop_proxy(), data_source, need_key_cb));
+  return CreateFilterCollection(demuxer.Pass(), decryptor);
 }
 
 scoped_ptr<FilterCollection>
 PipelineIntegrationTestBase::CreateFilterCollection(
-    const scoped_refptr<Demuxer>& demuxer,
+    scoped_ptr<Demuxer> demuxer,
     Decryptor* decryptor) {
+  demuxer_ = demuxer.Pass();
+
   scoped_ptr<FilterCollection> collection(new FilterCollection());
-  collection->SetDemuxer(demuxer);
+  collection->SetDemuxer(demuxer_.get());
 
   ScopedVector<VideoDecoder> video_decoders;
   video_decoders.push_back(