Convert //base to use std::unique_ptr

base/json/json_file_value_serializer.h

Index: base/json/json_file_value_serializer.h
diff --git a/base/json/json_file_value_serializer.h b/base/json/json_file_value_serializer.h
index f6b4e5fc223730b523ec0094fbaa94211888c62f..67d2342b4cc16074a5e548afa02e7ddaebafcfbc 100644
--- a/base/json/json_file_value_serializer.h
+++ b/base/json/json_file_value_serializer.h
@@ -60,8 +60,8 @@ class BASE_EXPORT JSONFileValueDeserializer : public base::ValueDeserializer {
   // If |error_message| is non-null, it will be filled in with a formatted
   // error message including the location of the error if appropriate.
   // The caller takes ownership of the returned value.
-  scoped_ptr<base::Value> Deserialize(int* error_code,
-                                      std::string* error_message) override;
+  std::unique_ptr<base::Value> Deserialize(int* error_code,
+                                           std::string* error_message) override;
 
   // This enum is designed to safely overlap with JSONReader::JsonParseError.
   enum JsonFileError {