Remove raw base::DictionaryValue::Set in //extensions

extensions/browser/api/app_window/app_window_api.cc

Index: extensions/browser/api/app_window/app_window_api.cc
diff --git a/extensions/browser/api/app_window/app_window_api.cc b/extensions/browser/api/app_window/app_window_api.cc
index 56962426cd3be9c1811fc088bb6b833077730bfe..0edbaef231864c172fec63d8dd6884efc01bd591 100644
--- a/extensions/browser/api/app_window/app_window_api.cc
+++ b/extensions/browser/api/app_window/app_window_api.cc
@@ -195,7 +195,7 @@ ExtensionFunction::ResponseAction AppWindowCreateFunction::Run() {
 
           std::unique_ptr<base::DictionaryValue> result(
               new base::DictionaryValue);
-          result->Set("frameId", new base::Value(frame_id));
+          result->SetInteger("frameId", frame_id);
           existing_window->GetSerializedState(result.get());
           result->SetBoolean("existingWindow", true);
           return RespondNow(OneArgument(std::move(result)));
@@ -376,8 +376,8 @@ ExtensionFunction::ResponseAction AppWindowCreateFunction::Run() {
     frame_id = created_frame->GetRoutingID();
 
   std::unique_ptr<base::DictionaryValue> result(new base::DictionaryValue);
-  result->Set("frameId", new base::Value(frame_id));
-  result->Set("id", new base::Value(app_window->window_key()));
+  result->SetInteger("frameId", frame_id);
+  result->SetString("id", app_window->window_key());
   app_window->GetSerializedState(result.get());
   ResponseValue result_arg = OneArgument(std::move(result));