Rename CustomElementUpgradeCandidateMap::DestructionObserverMap.

Source/core/dom/CustomElementUpgradeCandidateMap.h

 /*
  * 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 29 matching lines @@
 namespace WebCore {
 
 class Element;
 
 class CustomElementUpgradeCandidateMap {
     WTF_MAKE_NONCOPYABLE(CustomElementUpgradeCandidateMap);
 public:
     CustomElementUpgradeCandidateMap() { }
     ~CustomElementUpgradeCandidateMap();
 
+    // API for CustomElement to notify observers
     static void elementWasDestroyed(Element*);
 
+    // API for CustomElementRegistrationContext to save and take candidates
+
+    typedef ListHashSet<Element*> ElementSet;
+
     void add(const CustomElementDescriptor&, Element*);
     void remove(Element*);
-
-    typedef ListHashSet<Element*> ElementSet;
     ElementSet takeUpgradeCandidatesFor(const CustomElementDescriptor&);
 
 private:
-    // Maps elements to upgrade candidate maps observing their destruction
-    typedef HashMap<Element*, CustomElementUpgradeCandidateMap*> DestructionObserverMap;
-    static DestructionObserverMap& destructionObservers();
-    static void registerForElementDestructionNotification(Element*, CustomElementUpgradeCandidateMap*);
-    static void unregisterForElementDestructionNotification(Element*, CustomElementUpgradeCandidateMap*);
+    // Maps elements to upgrade candidate maps observing them
+    typedef HashMap<Element*, CustomElementUpgradeCandidateMap*> ElementObserverMap;
+    static ElementObserverMap& elementObservers();
+    void observe(Element*);
+    void unobserve(Element*);
 
     typedef HashMap<Element*, CustomElementDescriptor> UpgradeCandidateMap;
     UpgradeCandidateMap m_upgradeCandidates;
 
     typedef HashMap<CustomElementDescriptor, ElementSet> UnresolvedDefinitionMap;
     UnresolvedDefinitionMap m_unresolvedDefinitions;
 };
 
 }
 
 #endif // CustomElementUpgradeCandidateMap_h