Convert implicit scoped_refptr constructor calls to explicit ones, part 1

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 493108a38ab6aef04e4d0718daa6caa99373d5eb..658bd8aac686e91ffb1a27499b8b2e118687a049 100644
--- a/media/filters/ffmpeg_demuxer.cc
+++ b/media/filters/ffmpeg_demuxer.cc
@@ -126,8 +126,8 @@ void FFmpegDemuxerStream::EnqueuePacket(AVPacket* packet) {
   }
 
   // Enqueue the callback and attempt to satisfy a read immediately.
-  scoped_refptr<Buffer> buffer =
-      new AVPacketBuffer(packet, timestamp, duration);
+  scoped_refptr<Buffer> buffer(
+      new AVPacketBuffer(packet, timestamp, duration));
   if (!buffer) {
     NOTREACHED() << "Unable to allocate AVPacketBuffer";
     return;