Oilpan: have DOMException be on the heap by default.

Source/modules/serviceworkers/ServiceWorkerError.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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (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 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:
     WTF_MAKE_NONCOPYABLE(ServiceWorkerError);
     ServiceWorkerError() = delete;
 };
 
 } // namespace blink
 
 #endif // ServiceWorkerError_h