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

chrome/renderer/extensions/notifications_native_handler.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/notifications_native_handler.h"
 
 #include <memory>
 #include <string>
 
 #include "base/logging.h"
@@ skipping 13 matching lines @@
                  base::Unretained(this)));
 }
 
 void NotificationsNativeHandler::GetNotificationImageSizes(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   NotificationBitmapSizes bitmap_sizes = GetNotificationBitmapSizes();
 
   float scale_factor =
       ui::GetScaleForScaleFactor(ui::GetSupportedScaleFactors().back());
 
+  // TODO(devlin): Prefer gin::DataObjectBuilder here.

[Devlin, 2017/06/12 20:22:16]

(If https://codereview.chromium.org/2937543002/ lands first, I'll update this)

   std::unique_ptr<base::DictionaryValue> dict(new base::DictionaryValue);
   dict->SetDouble("scaleFactor", scale_factor);
   dict->SetInteger("icon.width", bitmap_sizes.icon_size.width());
   dict->SetInteger("icon.height", bitmap_sizes.icon_size.height());
   dict->SetInteger("image.width", bitmap_sizes.image_size.width());
   dict->SetInteger("image.height", bitmap_sizes.image_size.height());
   dict->SetInteger("buttonIcon.width", bitmap_sizes.button_icon_size.width());
   dict->SetInteger("buttonIcon.height", bitmap_sizes.button_icon_size.height());
   dict->SetInteger("appIconMask.width",
                    bitmap_sizes.app_icon_mask_size.width());
   dict->SetInteger("appIconMask.height",
                    bitmap_sizes.app_icon_mask_size.height());
 
-  std::unique_ptr<content::V8ValueConverter> converter(
-      content::V8ValueConverter::create());
-  args.GetReturnValue().Set(
-      converter->ToV8Value(dict.get(), context()->v8_context()));
+  args.GetReturnValue().Set(content::V8ValueConverter::Create()->ToV8Value(
+      dict.get(), context()->v8_context()));
 }
 
 }  // namespace extensions