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

media/filters/vp9_parser_unittest.cc

Index: media/filters/vp9_parser_unittest.cc
diff --git a/media/filters/vp9_parser_unittest.cc b/media/filters/vp9_parser_unittest.cc
index c7c64822835b60399f9cc05720f86a3989a6178e..25915e73229a3e38385a31d1458a701763df233b 100644
--- a/media/filters/vp9_parser_unittest.cc
+++ b/media/filters/vp9_parser_unittest.cc
@@ -41,7 +41,7 @@ class Vp9ParserTest : public ::testing::Test {
   }
 
   IvfParser ivf_parser_;
-  scoped_ptr<base::MemoryMappedFile> stream_;
+  std::unique_ptr<base::MemoryMappedFile> stream_;
 
   Vp9Parser vp9_parser_;
 };