Add Stop() to AudioDecoder.

media/filters/audio_decoder_selector.cc

Index: media/filters/audio_decoder_selector.cc
diff --git a/media/filters/audio_decoder_selector.cc b/media/filters/audio_decoder_selector.cc
index 4f7889b2619f3793a85765522d7ec2a1d6f5d34a..f0de25d220a61829b3c44324fdec42f8a01186cf 100644
--- a/media/filters/audio_decoder_selector.cc
+++ b/media/filters/audio_decoder_selector.cc
@@ -90,10 +90,10 @@ void AudioDecoderSelector::Abort() {
   weak_ptr_factory_.InvalidateWeakPtrs();
 
   if (audio_decoder_) {
-    // AudioDecoder doesn't provide a Stop() method. Also, |decrypted_stream_|
-    // is either NULL or already initialized. We don't need to Reset()
-    // |decrypted_stream_| in either case.
-    ReturnNullDecoder();
+    // |decrypted_stream_| is either NULL or already initialized. We don't
+    // need to Reset() |decrypted_stream_| in either case.
+    audio_decoder_->Stop(base::Bind(&AudioDecoderSelector::ReturnNullDecoder,
+                                    weak_ptr_factory_.GetWeakPtr()));
     return;
   }