Simplify CustomElementScheduler by passing the enum for callback type directly.

Source/core/dom/custom/CustomElementCallbackInvocation.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 89 matching lines @@
     }
 
 private:
     virtual void dispatch(Element*) OVERRIDE;
     virtual bool isCreated() const OVERRIDE { return true; }
 };
 
 void CreatedInvocation::dispatch(Element* element)
 {
     if (element->inDocument() && element->document().domWindow())
-        CustomElementScheduler::scheduleAttachedCallback(callbacks(), element);
+        CustomElementScheduler::scheduleCallback(callbacks(), element, CustomElementLifecycleCallbacks::Attached);
     callbacks()->created(element);
 }
 
 PassOwnPtr<CustomElementCallbackInvocation> CustomElementCallbackInvocation::createInvocation(PassRefPtr<CustomElementLifecycleCallbacks> callbacks, CustomElementLifecycleCallbacks::CallbackType which)
 {
     switch (which) {
     case CustomElementLifecycleCallbacks::Created:
         return adoptPtr(new CreatedInvocation(callbacks));
 
     case CustomElementLifecycleCallbacks::Attached:
     case CustomElementLifecycleCallbacks::Detached:
         return adoptPtr(new AttachedDetachedInvocation(callbacks, which));
     default:
         ASSERT_NOT_REACHED();
         return PassOwnPtr<CustomElementCallbackInvocation>();
     }
 }
 
 PassOwnPtr<CustomElementCallbackInvocation> CustomElementCallbackInvocation::createAttributeChangedInvocation(PassRefPtr<CustomElementLifecycleCallbacks> callbacks, const AtomicString& name, const AtomicString& oldValue, const AtomicString& newValue)
 {
     return adoptPtr(new AttributeChangedInvocation(callbacks, name, oldValue, newValue));
 }
 
 } // namespace WebCore