[Extenisons Bindings] Support `unmanaged` property for events

extensions/renderer/api_event_handler.h

Index: extensions/renderer/api_event_handler.h
diff --git a/extensions/renderer/api_event_handler.h b/extensions/renderer/api_event_handler.h
index 13451d4b5cbec6f218d32cdd633b19d6f9659ed7..35278bba8a2f2fce6487eb733ae8d5d2ab448c70 100644
--- a/extensions/renderer/api_event_handler.h
+++ b/extensions/renderer/api_event_handler.h
@@ -42,10 +42,12 @@ class APIEventHandler {
                   const EventListenersChangedMethod& listeners_changed);
   ~APIEventHandler();
 
-  // Returns a new v8::Object for an event with the given |event_name|.
+  // Returns a new v8::Object for an event with the given |event_name|. If
+  // |notify_on_change| is true, notifies whenever listeners state is changed.
   v8::Local<v8::Object> CreateEventInstance(const std::string& event_name,
                                             bool supports_filters,
                                             int max_listeners,
+                                            bool notify_on_change,
                                             v8::Local<v8::Context> context);
 
   // Creates a new event without any name. This is used by custom bindings when