Convert //extensions/browser/api from scoped_ptr to std::unique_ptr

extensions/browser/api/cast_channel/cast_framer.h

Index: extensions/browser/api/cast_channel/cast_framer.h
diff --git a/extensions/browser/api/cast_channel/cast_framer.h b/extensions/browser/api/cast_channel/cast_framer.h
index 6c54f686791cffaabef75229a2843474cbbf2361..ec8fcfe6088d95069bcadca0ccdb629f3ff1c105 100644
--- a/extensions/browser/api/cast_channel/cast_framer.h
+++ b/extensions/browser/api/cast_channel/cast_framer.h
@@ -8,10 +8,10 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "extensions/common/api/cast_channel.h"
 #include "net/base/io_buffer.h"
 
@@ -49,9 +49,9 @@ class MessageFramer {
   //         if no error occurred.
   // Returns A pointer to a parsed CastMessage if a message was received
   //         in its entirety, nullptr otherwise.
-  scoped_ptr<CastMessage> Ingest(size_t num_bytes,
-                                 size_t* message_length,
-                                 ChannelError* error);
+  std::unique_ptr<CastMessage> Ingest(size_t num_bytes,
+                                      size_t* message_length,
+                                      ChannelError* error);
 
   // Message header struct. If fields are added, be sure to update
   // header_size().  Public to allow use of *_size() methods in unit tests.