BuildPrototype should not be empty

atom/browser/api/atom_api_power_monitor.cc

@@ -53,6 +53,7 @@ v8::Local<v8::Value> PowerMonitor::Create(v8::Isolate* isolate) {
 // static
 void PowerMonitor::BuildPrototype(
     v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> prototype) {
+  mate::ObjectTemplateBuilder(isolate, prototype);
 }
 
 }  // namespace api