Oilpan: Prepare to move ResourceLoader and ResourceLoaderSet to Oilpan heap.

Source/core/fetch/ResourceLoaderSet.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #ifndef ResourceLoaderSet_h
 #define ResourceLoaderSet_h
 
 #include "core/fetch/ResourceLoader.h"
 #include "wtf/HashSet.h"
 
 namespace blink {
 
-class ResourceLoaderSet {
+class ResourceLoaderSet FINAL : public NoBaseWillBeGarbageCollected<ResourceLoaderSet> {
 public:
-    typedef HashSet<RefPtr<ResourceLoader> > SetType;
+    typedef WillBeHeapHashSet<RefPtrWillBeMember<ResourceLoader> > SetType;
 
-    void add(const RefPtr<ResourceLoader>& loader) { m_set.add(loader); }
-    void remove(const RefPtr<ResourceLoader>& loader) { m_set.remove(loader); }
+    static PassOwnPtrWillBeRawPtr<ResourceLoaderSet> create();
+    void trace(Visitor*);
+
+    void add(const RefPtrWillBeRawPtr<ResourceLoader>& loader) { m_set.add(loader); }
+    void remove(const RefPtrWillBeRawPtr<ResourceLoader>& loader) { m_set.remove(loader); }
     bool isEmpty() const { return m_set.isEmpty(); }
-    bool contains(const RefPtr<ResourceLoader>& loader) const { return m_set.contains(loader); }
+    bool contains(const RefPtrWillBeRawPtr<ResourceLoader>& loader) const { return m_set.contains(loader); }
     void cancelAll();
     void setAllDefersLoading(bool);
 
 private:
     SetType m_set;
 };
 
 }
 
 #endif