Oilpan: keep FormData on the heap by default.

Source/core/html/DOMFormData.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:
  *
  *     * 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 20 matching lines @@
 #ifndef DOMFormData_h
 #define DOMFormData_h
 
 #include "bindings/core/v8/Iterable.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/UnionTypesCore.h"
 #include "core/CoreExport.h"
 #include "core/html/FormDataList.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefCounted.h"
 
 namespace WTF{
 class TextEncoding;
 }
 
 namespace blink {
 
 class Blob;
 class HTMLFormElement;
 
 // Typedef from FormData.idl:
 typedef FileOrUSVString FormDataEntryValue;
 
 class CORE_EXPORT DOMFormData final : public FormDataList, public ScriptWrappable, public PairIterable<String, FormDataEntryValue> {
     DEFINE_WRAPPERTYPEINFO();
 
 public:
-    static PassRefPtrWillBeRawPtr<DOMFormData> create(HTMLFormElement* form = 0)
+    static DOMFormData* create(HTMLFormElement* form = 0)
     {
-        return adoptRefWillBeNoop(new DOMFormData(form));
+        return new DOMFormData(form);
     }
 
-    static PassRefPtrWillBeRawPtr<DOMFormData> create(const WTF::TextEncoding& encoding)
+    static DOMFormData* create(const WTF::TextEncoding& encoding)
     {
-        return adoptRefWillBeNoop(new DOMFormData(encoding));
+        return new DOMFormData(encoding);
     }
 
     // FormData interface.
     void append(const String& name, const String& value);
     void append(const String& name, Blob*, const String& filename = String());
     void get(const String& name, FormDataEntryValue& result);
     Vector<FormDataEntryValue> getAll(const String& name);
     void set(const String& name, const String& value);
     void set(const String& name, Blob*, const String& filename = String());
 
 private:
     explicit DOMFormData(const WTF::TextEncoding&);
     explicit DOMFormData(HTMLFormElement*);
 
     IterationSource* startIteration(ScriptState*, ExceptionState&) override;
 };
 
 } // namespace blink
 
 #endif // DOMFormData_h