Oilpan: Prepare to move HTMLResourcePreloader to Oilpan heap.

Source/core/html/parser/HTMLResourcePreloader.h

 /*
  * Copyright (C) 2013 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 65 matching lines @@
     KURL m_baseURL;
     String m_charset;
     Resource::Type m_resourceType;
     bool m_isCORSEnabled;
     StoredCredentials m_allowCredentials;
     double m_discoveryTime;
 };
 
 typedef Vector<OwnPtr<PreloadRequest> > PreloadRequestStream;
 
-class HTMLResourcePreloader {
-    WTF_MAKE_NONCOPYABLE(HTMLResourcePreloader); WTF_MAKE_FAST_ALLOCATED;
+class HTMLResourcePreloader FINAL : public NoBaseWillBeGarbageCollected<HTMLResourcePreloader> {
+    WTF_MAKE_NONCOPYABLE(HTMLResourcePreloader); WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
-    explicit HTMLResourcePreloader(Document* document)
-        : m_document(document)
-    {
-    }
+    static PassOwnPtrWillBeRawPtr<HTMLResourcePreloader> create(Document&);
+    void trace(Visitor*);
 
     void takeAndPreload(PreloadRequestStream&);
     void preload(PassOwnPtr<PreloadRequest>);
 
 private:
-    Document* m_document;
+    explicit HTMLResourcePreloader(Document&);
+
+    RawPtrWillBeMember<Document> m_document;
 };
 
 }
 
 #endif