Have CustomElement::didEnterDocument() / didLeaveDocument() take a reference

Source/core/dom/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 114 matching lines @@
     if (CustomElementDefinition* definition = definitions().get(element))
         CustomElementCallbackScheduler::scheduleCreatedCallback(definition->callbacks(), element);
 }
 
 void CustomElement::attributeDidChange(Element* element, const AtomicString& name, const AtomicString& oldValue, const AtomicString& newValue)
 {
     ASSERT(element->customElementState() == Element::Upgraded);
     CustomElementCallbackScheduler::scheduleAttributeChangedCallback(definitionFor(element)->callbacks(), element, name, oldValue, newValue);
 }
 
-void CustomElement::didEnterDocument(Element* element, Document* document)
+void CustomElement::didEnterDocument(Element* element, const Document& document)
 {
     ASSERT(element->customElementState() == Element::Upgraded);
-    if (!document->defaultView())
+    if (!document.defaultView())
         return;
     CustomElementCallbackScheduler::scheduleEnteredDocumentCallback(definitionFor(element)->callbacks(), element);
 }
 
-void CustomElement::didLeaveDocument(Element* element, Document* document)
+void CustomElement::didLeaveDocument(Element* element, const Document& document)
 {
     ASSERT(element->customElementState() == Element::Upgraded);
-    if (!document->defaultView())
+    if (!document.defaultView())
         return;
     CustomElementCallbackScheduler::scheduleLeftDocumentCallback(definitionFor(element)->callbacks(), element);
 }
 
 void CustomElement::wasDestroyed(Element* element)
 {
     switch (element->customElementState()) {
     case Element::NotCustomElement:
         ASSERT_NOT_REACHED();
         break;
@@ skipping 14 matching lines @@
     ASSERT(result.isNewEntry);
 }
 
 CustomElement::DefinitionMap& CustomElement::definitions()
 {
     DEFINE_STATIC_LOCAL(DefinitionMap, map, ());
     return map;
 }
 
 } // namespace WebCore