Oilpan: have DOMException be on the heap by default.

Source/modules/serviceworkers/ServiceWorkerError.h

Index: Source/modules/serviceworkers/ServiceWorkerError.h
diff --git a/Source/modules/serviceworkers/ServiceWorkerError.h b/Source/modules/serviceworkers/ServiceWorkerError.h
index da8ea88c9f5dd162ad2ecd890df483b329bb415c..2cee553f465a3a45bac65502beb93a52995a1ddc 100644
--- a/Source/modules/serviceworkers/ServiceWorkerError.h
+++ b/Source/modules/serviceworkers/ServiceWorkerError.h
@@ -31,20 +31,20 @@
 #ifndef ServiceWorkerError_h
 #define ServiceWorkerError_h
 
-#include "core/dom/DOMException.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebServiceWorkerError.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
+class DOMException;
 class ScriptPromiseResolver;
 
 class ServiceWorkerError {
 public:
     // For CallbackPromiseAdapter
     typedef WebServiceWorkerError WebType;
-    static PassRefPtrWillBeRawPtr<DOMException> take(ScriptPromiseResolver*, WebType* webErrorRaw);
+    static DOMException* take(ScriptPromiseResolver*, WebType* webErrorRaw);
     static void dispose(WebType* webErrorRaw);
 
 private: