Convert //base to use std::unique_ptr

base/json/json_string_value_serializer.h

Index: base/json/json_string_value_serializer.h
diff --git a/base/json/json_string_value_serializer.h b/base/json/json_string_value_serializer.h
index 2459f48a8a4ca0913673475442a4822ff7c2ae5d..a97da23920213797d233fe0296a1c94cfde53207 100644
--- a/base/json/json_string_value_serializer.h
+++ b/base/json/json_string_value_serializer.h
@@ -59,8 +59,8 @@ class BASE_EXPORT JSONStringValueDeserializer : 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;
 
   void set_allow_trailing_comma(bool new_value) {
     allow_trailing_comma_ = new_value;