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

extensions/renderer/api_binding_test_util.cc

 // Copyright 2016 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 "extensions/renderer/api_binding_test_util.h"
 
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
@@ skipping 92 matching lines @@
 v8::Local<v8::Function> FunctionFromString(v8::Local<v8::Context> context,
                                            base::StringPiece source) {
   v8::Local<v8::Value> value = V8ValueFromScriptSource(context, source);
   v8::Local<v8::Function> function;
   EXPECT_TRUE(gin::ConvertFromV8(context->GetIsolate(), value, &function));
   return function;
 }
 
 std::unique_ptr<base::Value> V8ToBaseValue(v8::Local<v8::Value> value,
                                            v8::Local<v8::Context> context) {
-  std::unique_ptr<content::V8ValueConverter> converter(
-      content::V8ValueConverter::create());
-  return converter->FromV8Value(value, context);
+  return content::V8ValueConverter::Create()->FromV8Value(value, context);
 }
 
 v8::Local<v8::Value> RunFunction(v8::Local<v8::Function> function,
                                  v8::Local<v8::Context> context,
                                  v8::Local<v8::Value> receiver,
                                  int argc,
                                  v8::Local<v8::Value> argv[]) {
   std::string error;
   v8::Local<v8::Value> result;
   EXPECT_TRUE(
@@ skipping 75 matching lines @@
   return V8ToBaseValue(GetPropertyFromObject(object, context, key), context);
 }
 
 std::string GetStringPropertyFromObject(v8::Local<v8::Object> object,
                                         v8::Local<v8::Context> context,
                                         base::StringPiece key) {
   return V8ToString(GetPropertyFromObject(object, context, key), context);
 }
 
 }  // namespace extensions