Rename ContextDestructionObserver to ContextLifecycleObserver

Source/core/dom/CustomElementRegistry.cpp

 /*
  * Copyright (C) 2012 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 44 matching lines @@
 }
 
 void setTypeExtension(Element* element, const AtomicString& typeExtension)
 {
     ASSERT(element);
     if (!typeExtension.isEmpty())
         element->setAttribute(HTMLNames::isAttr, typeExtension);
 }
 
 CustomElementRegistry::CustomElementRegistry(Document* document)
-    : ContextDestructionObserver(document)
+    : ContextLifecycleObserver(document)
 {
 }
 
 CustomElementRegistry::~CustomElementRegistry()
 {
     deactivate();
 }
 
 static inline bool nameIncludesHyphen(const AtomicString& name)
 {
@@ skipping 238 matching lines @@
     while (!activeCustomElementRegistries().isEmpty()) {
         Vector<RefPtr<CustomElementRegistry> > registries;
         copyToVector(activeCustomElementRegistries(), registries);
         activeCustomElementRegistries().clear();
         for (size_t i = 0; i < registries.size(); ++i)
             registries[i]->deliverLifecycleCallbacks();
     }
 }
 
 }