Avoid firing load events on style elements if there is no listeners for that

third_party/WebKit/Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  *
@@ skipping 1849 matching lines @@
 }
 
 void Node::DidMoveToNewDocument(Document& old_document) {
   TreeScopeAdopter::EnsureDidMoveToNewDocumentWasCalled(old_document);
 
   if (const EventTargetData* event_target_data = this->GetEventTargetData()) {
     const EventListenerMap& listener_map =
         event_target_data->event_listener_map;
     if (!listener_map.IsEmpty()) {
       for (const auto& type : listener_map.EventTypes())
-        GetDocument().AddListenerTypeIfNeeded(type);
+        GetDocument().AddListenerTypeIfNeeded(type, *this);
     }
   }
 
   old_document.Markers().RemoveMarkersForNode(this);
   if (GetDocument().GetPage() &&
       GetDocument().GetPage() != old_document.GetPage()) {
     GetDocument().GetPage()->GetEventHandlerRegistry().DidMoveIntoPage(*this);
   }
 
   if (const HeapVector<TraceWrapperMember<MutationObserverRegistration>>*
           registry = MutationObserverRegistry()) {
     for (const auto& registration : *registry) {
       GetDocument().AddMutationObserverTypes(registration->MutationTypes());
     }
   }
 
   if (TransientMutationObserverRegistry()) {
     for (MutationObserverRegistration* registration :
          *TransientMutationObserverRegistry())
       GetDocument().AddMutationObserverTypes(registration->MutationTypes());
   }
 }
 
 void Node::AddedEventListener(const AtomicString& event_type,
                               RegisteredEventListener& registered_listener) {
   EventTarget::AddedEventListener(event_type, registered_listener);
-  GetDocument().AddListenerTypeIfNeeded(event_type);
+  GetDocument().AddListenerTypeIfNeeded(event_type, *this);
   if (Page* page = GetDocument().GetPage())
     page->GetEventHandlerRegistry().DidAddEventHandler(
         *this, event_type, registered_listener.Options());
 }
 
 void Node::RemovedEventListener(
     const AtomicString& event_type,
     const RegisteredEventListener& registered_listener) {
   EventTarget::RemovedEventListener(event_type, registered_listener);
   // FIXME: Notify Document that the listener has vanished. We need to keep
@@ skipping 659 matching lines @@
   if (node) {
     std::stringstream stream;
     node->PrintNodePathTo(stream);
     LOG(INFO) << stream.str();
   } else {
     LOG(INFO) << "Cannot showNodePath for <null>";
   }
 }
 
 #endif