Convert MediaLog from being ref counted to owned by WebMediaPlayer.

media/blink/webaudiosourceprovider_impl.cc

Index: media/blink/webaudiosourceprovider_impl.cc
diff --git a/media/blink/webaudiosourceprovider_impl.cc b/media/blink/webaudiosourceprovider_impl.cc
index 09ee98ba3a742d6d904129467144e5f35afa304f..4cace4314b4203352d45914770eafa38930597a3 100644
--- a/media/blink/webaudiosourceprovider_impl.cc
+++ b/media/blink/webaudiosourceprovider_impl.cc
@@ -100,13 +100,13 @@ class WebAudioSourceProviderImpl::TeeFilter
 
 WebAudioSourceProviderImpl::WebAudioSourceProviderImpl(
     scoped_refptr<SwitchableAudioRendererSink> sink,
-    scoped_refptr<MediaLog> media_log)
+    MediaLog* media_log)
     : volume_(1.0),
       state_(kStopped),
       client_(nullptr),
       sink_(std::move(sink)),
       tee_filter_(new TeeFilter()),
-      media_log_(std::move(media_log)),
+      media_log_(media_log),
       weak_factory_(this) {}
 
 WebAudioSourceProviderImpl::~WebAudioSourceProviderImpl() {