Convert //media/filters from scoped_ptr to std::unique_ptr

media/filters/ffmpeg_glue.cc

Index: media/filters/ffmpeg_glue.cc
diff --git a/media/filters/ffmpeg_glue.cc b/media/filters/ffmpeg_glue.cc
index ab80cb9aa34b0a7e2031ec899e17f83dab1cb4f7..56720145e6ba9379453c357cfa91a61747bc6627 100644
--- a/media/filters/ffmpeg_glue.cc
+++ b/media/filters/ffmpeg_glue.cc
@@ -162,7 +162,7 @@ bool FFmpegGlue::OpenContext() {
 
   // Attempt to recognize the container by looking at the first few bytes of the
   // stream. The stream position is left unchanged.
-  scoped_ptr<std::vector<uint8_t>> buffer(new std::vector<uint8_t>(8192));
+  std::unique_ptr<std::vector<uint8_t>> buffer(new std::vector<uint8_t>(8192));
 
   int64_t pos = AVIOSeekOperation(avio_context_.get()->opaque, 0, SEEK_CUR);
   AVIOSeekOperation(avio_context_.get()->opaque, 0, SEEK_SET);