[Oilpan] De-oilpanize ScopedPageLoadDeferrer.

Source/core/page/ScopedPageLoadDeferrer.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 12 matching lines @@
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class LocalFrame;
 class Page;
 
-class CORE_EXPORT ScopedPageLoadDeferrer final : public NoBaseWillBeGarbageCollectedFinalized<ScopedPageLoadDeferrer> {
+class CORE_EXPORT ScopedPageLoadDeferrer final {
     WTF_MAKE_NONCOPYABLE(ScopedPageLoadDeferrer);
-    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(ScopedPageLoadDeferrer);
+    WTF_MAKE_FAST_ALLOCATED(ScopedPageLoadDeferrer);
 public:
-    ScopedPageLoadDeferrer(Page* exclusion = nullptr);
+    explicit ScopedPageLoadDeferrer(Page* exclusion = nullptr);
     ~ScopedPageLoadDeferrer();
 
-#if ENABLE(OILPAN)
-    void dispose();
-#endif
-
-    DECLARE_TRACE();
-
 private:
     void detach();
 
-    WillBeHeapVector<RefPtrWillBeMember<LocalFrame>, 16> m_deferredFrames;
-    bool m_detached;
+    Vector<RefPtrWillBePersistent<LocalFrame>, 16> m_deferredFrames;
 };
 
 } // namespace blink
 
 #endif // ScopedPageLoadDeferrer_h