Oilpan: have DOMException be on the heap by default.

Source/core/dom/DOMException.h

Index: Source/core/dom/DOMException.h
diff --git a/Source/core/dom/DOMException.h b/Source/core/dom/DOMException.h
index 270ba87a9f84791178c832b94354fd2c8f0d2fc2..e826129825dc358f3d6827f8ff364b1880dfd3ec 100644
--- a/Source/core/dom/DOMException.h
+++ b/Source/core/dom/DOMException.h
@@ -32,18 +32,16 @@
 #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; }