Rename CustomElementUpgradeCandidateMap::DestructionObserverMap.

Source/core/dom/CustomElementUpgradeCandidateMap.h

Index: Source/core/dom/CustomElementUpgradeCandidateMap.h
diff --git a/Source/core/dom/CustomElementUpgradeCandidateMap.h b/Source/core/dom/CustomElementUpgradeCandidateMap.h
index 2814c0a2d200720f308ada21e94e8da318e1172d..4456964df326ebd48032532cb56c8f1a0b384ad7 100644
--- a/Source/core/dom/CustomElementUpgradeCandidateMap.h
+++ b/Source/core/dom/CustomElementUpgradeCandidateMap.h
@@ -47,20 +47,23 @@ public:
     CustomElementUpgradeCandidateMap() { }
     ~CustomElementUpgradeCandidateMap();
 
+    // API for CustomElement to notify observers
     static void elementWasDestroyed(Element*);
 
-    void add(const CustomElementDescriptor&, Element*);
-    void remove(Element*);
+    // API for CustomElementRegistrationContext to save and take candidates
 
     typedef ListHashSet<Element*> ElementSet;
+
+    void add(const CustomElementDescriptor&, Element*);
+    void remove(Element*);
     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;