Revert of Remove ineffective PendingScript prefinalizer (2nd attempt.)

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

 /*
  * Copyright (C) 2010 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 29 matching lines @@
 class ScriptSourceCode;
 
 // A container for an external script which may be loaded and executed.
 //
 // TODO(kochi): The comment below is from pre-oilpan age and may not be correct now.
 // A RefPtr alone does not prevent the underlying Resource
 // from purging its data buffer. This class holds a dummy client open for its
 // lifetime in order to guarantee that the data buffer will not be purged.
 class CORE_EXPORT PendingScript final : public GarbageCollectedFinalized<PendingScript>, public ResourceOwner<ScriptResource> {
     USING_GARBAGE_COLLECTED_MIXIN(PendingScript);
+    USING_PRE_FINALIZER(PendingScript, dispose);
     WTF_MAKE_NONCOPYABLE(PendingScript);
 public:
     static PendingScript* create(Element*, ScriptResource*);
     ~PendingScript() override;
 
     TextPosition startingPosition() const { return m_startingPosition; }
     void setStartingPosition(const TextPosition& position) { m_startingPosition = position; }
     void markParserBlockingLoadStartTime();
     // Returns the time the load of this script started blocking the parser, or
     // zero if this script hasn't yet blocked the parser, in
@@ skipping 34 matching lines @@
     bool m_integrityFailure;
     double m_parserBlockingLoadStartTime;
 
     Member<ScriptStreamer> m_streamer;
     Member<ScriptResourceClient> m_client;
 };
 
 } // namespace blink
 
 #endif // PendingScript_h