Replace scoped_ptr with std::unique_ptr in //media/base.

media/base/bitstream_buffer.h

Index: media/base/bitstream_buffer.h
diff --git a/media/base/bitstream_buffer.h b/media/base/bitstream_buffer.h
index 000836eaa85e80e7744c6cf1d76198e93d61df71..677b25602f2a140d5c3183e8e9f2289c818929f5 100644
--- a/media/base/bitstream_buffer.h
+++ b/media/base/bitstream_buffer.h
@@ -82,7 +82,7 @@ class MEDIA_EXPORT BitstreamBuffer {
 
   // The following fields come from DecryptConfig.
   // TODO(timav): Try to DISALLOW_COPY_AND_ASSIGN and include these params as
-  // scoped_ptr<DecryptConfig> or explain why copy & assign is needed.
+  // std::unique_ptr<DecryptConfig> or explain why copy & assign is needed.
 
   std::string key_id_;                      // key ID.
   std::string iv_;                          // initialization vector