Move AudioDecoder initialization into AudioRenderer.

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 1e961a8122f660aef6027df6f6404dc321bcb6c0..0d1529edd879e4c4ec88abb9d5d907cc56575f84 100644
--- a/media/filters/pipeline_integration_test_base.cc
+++ b/media/filters/pipeline_integration_test_base.cc
@@ -199,16 +199,17 @@ PipelineIntegrationTestBase::CreateFilterCollection(
     Decryptor* decryptor) {
   scoped_ptr<FilterCollection> collection(new FilterCollection());
   collection->SetDemuxer(demuxer);
-  collection->AddAudioDecoder(new FFmpegAudioDecoder(
+  scoped_refptr<AudioDecoder> audio_decoder = new FFmpegAudioDecoder(
       base::Bind(&MessageLoopFactory::GetMessageLoop,
                  base::Unretained(message_loop_factory_.get()),
-                 media::MessageLoopFactory::kAudioDecoder)));
-  scoped_refptr<VideoDecoder> decoder = new FFmpegVideoDecoder(
+                 media::MessageLoopFactory::kAudioDecoder));
+  collection->GetAudioDecoders()->push_back(audio_decoder);
+  scoped_refptr<VideoDecoder> video_decoder = new FFmpegVideoDecoder(
       base::Bind(&MessageLoopFactory::GetMessageLoop,
                  base::Unretained(message_loop_factory_.get()),
                  media::MessageLoopFactory::kVideoDecoder),
       decryptor);
-  collection->GetVideoDecoders()->push_back(decoder);
+  collection->GetVideoDecoders()->push_back(video_decoder);
 
   // Disable frame dropping if hashing is enabled.
   renderer_ = new VideoRendererBase(