[Content] Update V8ValueConverter::create to return a std::unique_ptr

chrome/renderer/extensions/platform_keys_natives.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/extensions/platform_keys_natives.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 
@@ skipping 107 matching lines @@
       v8::Local<v8::Object>::Cast(call_info[0]), operation, &exception_code,
       &error_details, call_info.GetIsolate());
 
   std::unique_ptr<base::DictionaryValue> algorithm_dict;
   if (!algorithm.IsNull())
     algorithm_dict = WebCryptoAlgorithmToBaseValue(algorithm);
 
   if (!algorithm_dict)
     return;
 
-  std::unique_ptr<content::V8ValueConverter> converter(
-      content::V8ValueConverter::create());
-  call_info.GetReturnValue().Set(
-      converter->ToV8Value(algorithm_dict.get(), context()->v8_context()));
+  call_info.GetReturnValue().Set(content::V8ValueConverter::Create()->ToV8Value(
+      algorithm_dict.get(), context()->v8_context()));
 }
 
 }  // namespace extensions