[Extenisons Bindings] Support `unmanaged` property for events

extensions/renderer/chrome_setting.cc

Index: extensions/renderer/chrome_setting.cc
diff --git a/extensions/renderer/chrome_setting.cc b/extensions/renderer/chrome_setting.cc
index 4753dbe3e77747bf6d98fa6369fa6312e367022b..2509bfbb593fceac992cc988054799690e07061d 100644
--- a/extensions/renderer/chrome_setting.cc
+++ b/extensions/renderer/chrome_setting.cc
@@ -116,7 +116,7 @@ v8::Local<v8::Value> ChromeSetting::GetOnChangeEvent(
     event = event_handler_->CreateEventInstance(
         base::StringPrintf("types.ChromeSetting.%s.onChange",
                            pref_name_.c_str()),
-        supports_filters, binding::kNoListenerMax, context);
+        supports_filters, binding::kNoListenerMax, true, context);
     v8::Maybe<bool> set_result = wrapper->SetPrivate(context, key, event);
     if (!set_result.IsJust() || !set_result.FromJust()) {
       NOTREACHED();