Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/dom/IdTargetObserver.h

 /*
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 15 matching lines @@
 #ifndef IdTargetObserver_h
 #define IdTargetObserver_h
 
 #include "platform/heap/Handle.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 class IdTargetObserverRegistry;
 
-class IdTargetObserver : public NoBaseWillBeGarbageCollectedFinalized<IdTargetObserver> {
+class IdTargetObserver : public GarbageCollectedFinalized<IdTargetObserver> {
 public:
     virtual ~IdTargetObserver();
     DECLARE_VIRTUAL_TRACE();
     virtual void idTargetChanged() = 0;
     virtual void unregister();
 
 protected:
     IdTargetObserver(IdTargetObserverRegistry&, const AtomicString& id);
 
 private:
     IdTargetObserverRegistry& registry() { return *m_registry; }
 
-    RawPtrWillBeMember<IdTargetObserverRegistry> m_registry;
+    Member<IdTargetObserverRegistry> m_registry;
     AtomicString m_id;
 };
 
 } // namespace blink
 
 #endif // IdTargetObserver_h