Oilpan: have DOMException be on the heap by default.

Source/modules/bluetooth/BluetoothError.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BluetoothError_h
 #define BluetoothError_h
 
-#include "core/dom/DOMException.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
+class DOMException;
 class ScriptPromiseResolver;
 struct WebBluetoothError;
 
 // BluetoothError is used with CallbackPromiseAdapter to receive
 // WebBluetoothError responses. See CallbackPromiseAdapter class comments.
 class BluetoothError {
     WTF_MAKE_NONCOPYABLE(BluetoothError);
 public:
     // Interface required by CallbackPromiseAdapter:
     typedef WebBluetoothError WebType;
-    static PassRefPtrWillBeRawPtr<DOMException> take(ScriptPromiseResolver*, WebBluetoothError*);
+    static DOMException* take(ScriptPromiseResolver*, WebBluetoothError*);
     static void dispose(blink::WebBluetoothError*);
 
 private:
     BluetoothError() = delete;
 };
 
 } // namespace blink
 
 #endif // BluetoothError_h