Remove reference counting from media::DemuxerStream and friends.

media/filters/ffmpeg_audio_decoder_unittest.cc

Index: media/filters/ffmpeg_audio_decoder_unittest.cc
diff --git a/media/filters/ffmpeg_audio_decoder_unittest.cc b/media/filters/ffmpeg_audio_decoder_unittest.cc
index 6a9aecd99570999674735c34cd0ccd25fc8c80aa..dcf6ea6c1bc306c95d59164550e38e25731492a3 100644
--- a/media/filters/ffmpeg_audio_decoder_unittest.cc
+++ b/media/filters/ffmpeg_audio_decoder_unittest.cc
@@ -70,7 +70,7 @@ class FFmpegAudioDecoderTest : public testing::Test {
     EXPECT_CALL(*demuxer_, audio_decoder_config())
         .WillRepeatedly(ReturnRef(config_));
 
-    decoder_->Initialize(demuxer_,
+    decoder_->Initialize(demuxer_.get(),
                          NewExpectedStatusCB(PIPELINE_OK),
                          base::Bind(&MockStatisticsCB::OnStatistics,
                                     base::Unretained(&statistics_cb_)));
@@ -113,7 +113,7 @@ class FFmpegAudioDecoderTest : public testing::Test {
 
   base::MessageLoop message_loop_;
   scoped_ptr<FFmpegAudioDecoder> decoder_;
-  scoped_refptr<StrictMock<MockDemuxerStream> > demuxer_;
+  scoped_ptr<StrictMock<MockDemuxerStream> > demuxer_;
   MockStatisticsCB statistics_cb_;
 
   scoped_refptr<DecoderBuffer> vorbis_extradata_;