Service Worker: Use ScriptPromise instead of ScriptPromise&.

Source/modules/serviceworkers/RespondWithObserver.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 RespondWithObserver_h
 #define RespondWithObserver_h
 
 #include "core/dom/ContextLifecycleObserver.h"
 #include "modules/ModulesExport.h"
 #include "platform/heap/Handle.h"
@@ skipping 14 matching lines @@
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(RespondWithObserver);
 public:
     static RespondWithObserver* create(ExecutionContext*, int eventID, const KURL& requestURL, WebURLRequest::FetchRequestMode, WebURLRequest::FrameType);
 
     void contextDestroyed() override;
 
     void didDispatchEvent(bool defaultPrevented);
 
     // Observes the promise and delays calling didHandleFetchEvent() until the
     // given promise is resolved or rejected.
-    void respondWith(ScriptState*, ScriptPromise&, ExceptionState&);
+    void respondWith(ScriptState*, ScriptPromise, ExceptionState&);
 
     void responseWasRejected(WebServiceWorkerResponseError);
     void responseWasFulfilled(const ScriptValue&);
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     class ThenFunction;
 
     RespondWithObserver(ExecutionContext*, int eventID, const KURL& requestURL, WebURLRequest::FetchRequestMode, WebURLRequest::FrameType);
 
     int m_eventID;
     KURL m_requestURL;
     WebURLRequest::FetchRequestMode m_requestMode;
     WebURLRequest::FrameType m_frameType;
 
     enum State { Initial, Pending, Done };
     State m_state;
 };
 
 } // namespace blink
 
 #endif // RespondWithObserver_h