Update media/ to use scoped_refptr<T>::get() rather than implicit "operator T*"

media/filters/ffmpeg_demuxer.cc

Index: media/filters/ffmpeg_demuxer.cc
diff --git a/media/filters/ffmpeg_demuxer.cc b/media/filters/ffmpeg_demuxer.cc
index ff935950639453b2462e7397d99bdb02a93db97a..4196f3425d1d1c1fbb305ab9949e571aa30a6f95 100644
--- a/media/filters/ffmpeg_demuxer.cc
+++ b/media/filters/ffmpeg_demuxer.cc
@@ -300,7 +300,7 @@ FFmpegDemuxer::FFmpegDemuxer(
       url_protocol_(data_source, BindToLoop(message_loop_, base::Bind(
           &FFmpegDemuxer::OnDataSourceError, base::Unretained(this)))),
       need_key_cb_(need_key_cb) {
-  DCHECK(message_loop_);
+  DCHECK(message_loop_.get());
   DCHECK(data_source_);
 }