Convert MediaLog from being ref counted to owned by WebMediaPlayer.

media/blink/webmediasource_impl.h

Index: media/blink/webmediasource_impl.h
diff --git a/media/blink/webmediasource_impl.h b/media/blink/webmediasource_impl.h
index 281b08ba3b18b79ba5d8afbfb28afe2ff19c96cf..025fc56a27455d141a4ea1090ddcb3fb93314ac9 100644
--- a/media/blink/webmediasource_impl.h
+++ b/media/blink/webmediasource_impl.h
@@ -9,7 +9,6 @@
 #include <vector>
 
 #include "base/macros.h"
-#include "media/base/media_log.h"
 #include "media/blink/media_blink_export.h"
 #include "third_party/WebKit/public/platform/WebMediaSource.h"
 
@@ -19,8 +18,7 @@ class ChunkDemuxer;
 class MEDIA_BLINK_EXPORT WebMediaSourceImpl
     : NON_EXPORTED_BASE(public blink::WebMediaSource) {
  public:
-  WebMediaSourceImpl(ChunkDemuxer* demuxer,
-                     const scoped_refptr<MediaLog>& media_log);
+  WebMediaSourceImpl(ChunkDemuxer* demuxer);
   ~WebMediaSourceImpl() override;
 
   // blink::WebMediaSource implementation.
@@ -34,7 +32,6 @@ class MEDIA_BLINK_EXPORT WebMediaSourceImpl
 
  private:
   ChunkDemuxer* demuxer_;  // Owned by WebMediaPlayerImpl.
-  scoped_refptr<MediaLog> media_log_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMediaSourceImpl);
 };