Simplify CustomElementScheduler by passing the enum for callback type directly.

Source/core/dom/custom/CustomElement.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 80 matching lines @@
     RefPtr<CustomElementDefinition> definition(passDefinition);
 
     switch (element->customElementState()) {
     case Element::NotCustomElement:
     case Element::Upgraded:
         ASSERT_NOT_REACHED();
         break;
 
     case Element::WaitingForUpgrade:
         element->setCustomElementDefinition(definition);
-        CustomElementScheduler::scheduleCreatedCallback(definition->callbacks(), element);
+        CustomElementScheduler::scheduleCallback(definition->callbacks(), element, CustomElementLifecycleCallbacks::Created);
         break;
     }
 }
 
 void CustomElement::attributeDidChange(Element* element, const AtomicString& name, const AtomicString& oldValue, const AtomicString& newValue)
 {
     ASSERT(element->customElementState() == Element::Upgraded);
     CustomElementScheduler::scheduleAttributeChangedCallback(element->customElementDefinition()->callbacks(), element, name, oldValue, newValue);
 }
 
 void CustomElement::didEnterDocument(Element* element, const Document& document)
 {
     ASSERT(element->customElementState() == Element::Upgraded);
     if (!document.domWindow())
         return;
-    CustomElementScheduler::scheduleAttachedCallback(element->customElementDefinition()->callbacks(), element);
+    CustomElementScheduler::scheduleCallback(element->customElementDefinition()->callbacks(), element, CustomElementLifecycleCallbacks::Attached);
 }
 
 void CustomElement::didLeaveDocument(Element* element, const Document& document)
 {
     ASSERT(element->customElementState() == Element::Upgraded);
     if (!document.domWindow())
         return;
-    CustomElementScheduler::scheduleDetachedCallback(element->customElementDefinition()->callbacks(), element);
+    CustomElementScheduler::scheduleCallback(element->customElementDefinition()->callbacks(), element, CustomElementLifecycleCallbacks::Detached);
 }
 
 void CustomElement::wasDestroyed(Element* element)
 {
     switch (element->customElementState()) {
     case Element::NotCustomElement:
         ASSERT_NOT_REACHED();
         break;
 
     case Element::WaitingForUpgrade:
     case Element::Upgraded:
         CustomElementObserver::notifyElementWasDestroyed(element);
         break;
     }
 }
 
 } // namespace WebCore