Oilpan: have DOMException be on the heap by default.

Source/core/dom/DOMException.h

 /*
  * Copyright (C) 2007, 2008 Apple 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
@@ skipping 14 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DOMException_h
 #define DOMException_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefCounted.h"
-#include "wtf/text/WTFString.h"
+#include "wtf/Forward.h"
 
 namespace blink {
 
 typedef int ExceptionCode;
 
-class CORE_EXPORT DOMException final : public RefCountedWillBeGarbageCollectedFinalized<DOMException>, public ScriptWrappable {
+class CORE_EXPORT DOMException final : public GarbageCollectedFinalized<DOMException>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static PassRefPtrWillBeRawPtr<DOMException> create(ExceptionCode, const String& sanitizedMessage = String(), const String& unsanitizedMessage = String());
+    static DOMException* create(ExceptionCode, const String& sanitizedMessage = String(), const String& unsanitizedMessage = String());
 
     unsigned short code() const { return m_code; }
     String name() const { return m_name; }
 
     // This is the message that's exposed to JavaScript: never return unsanitized data.
     String message() const { return m_sanitizedMessage; }
     String toString() const;
 
     // This is the message that's exposed to the console: if an unsanitized message is present, we prefer it.
     String messageForConsole() const { return !m_unsanitizedMessage.isEmpty() ? m_unsanitizedMessage : m_sanitizedMessage; }
     String toStringForConsole() const;
 
     static String getErrorName(ExceptionCode);
     static String getErrorMessage(ExceptionCode);
 
     DEFINE_INLINE_TRACE() { }
 
 private:
     DOMException(unsigned short m_code, const String& name, const String& sanitizedMessage, const String& unsanitizedMessage);
 
     unsigned short m_code;
     String m_name;
     String m_sanitizedMessage;
     String m_unsanitizedMessage;
 };
 
 } // namespace blink
 
 #endif // DOMException_h