Convert MediaLog from being ref counted to owned by WebMediaPlayer.

media/blink/webencryptedmediaclient_impl.h

Index: media/blink/webencryptedmediaclient_impl.h
diff --git a/media/blink/webencryptedmediaclient_impl.h b/media/blink/webencryptedmediaclient_impl.h
index 6f792b629e06c4586b7b01ebc094c3c13d6b973d..68dbb32e38574dea692c996ff6b0eec521be1d82 100644
--- a/media/blink/webencryptedmediaclient_impl.h
+++ b/media/blink/webencryptedmediaclient_impl.h
@@ -38,7 +38,7 @@ class MEDIA_BLINK_EXPORT WebEncryptedMediaClientImpl
       base::Callback<bool(void)> are_secure_codecs_supported_cb,
       CdmFactory* cdm_factory,
       MediaPermission* media_permission,
-      const scoped_refptr<MediaLog>& media_log);
+      MediaLog* media_log);
   ~WebEncryptedMediaClientImpl() override;
 
   // WebEncryptedMediaClient implementation.
@@ -81,7 +81,7 @@ class MEDIA_BLINK_EXPORT WebEncryptedMediaClientImpl
   base::Callback<bool(void)> are_secure_codecs_supported_cb_;
   CdmFactory* cdm_factory_;
   KeySystemConfigSelector key_system_config_selector_;
-  scoped_refptr<MediaLog> media_log_;
+  MediaLog* media_log_;
   base::WeakPtrFactory<WebEncryptedMediaClientImpl> weak_factory_;
 };