FetchEvent should not forcibly reject an unresolved Promise when destructed

Source/modules/serviceworkers/RespondWithObserver.cpp

 // 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.
 
 #include "config.h"
 #include "modules/serviceworkers/RespondWithObserver.h"
 
 #include "bindings/core/v8/ScriptFunction.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptValue.h"
@@ skipping 44 matching lines @@
     ResolveType m_resolveType;
 };
 
 PassRefPtr<RespondWithObserver> RespondWithObserver::create(ExecutionContext* context, int eventID)
 {
     return adoptRef(new RespondWithObserver(context, eventID));
 }
 
 RespondWithObserver::~RespondWithObserver()
 {
-    if (m_state == Pending)
-        sendResponse(nullptr);
+    ASSERT(m_state != Pending);
 }
 
 void RespondWithObserver::contextDestroyed()
 {
     ContextLifecycleObserver::contextDestroyed();
     m_state = Done;
 }
 
 void RespondWithObserver::didDispatchEvent()
 {
@@ skipping 39 matching lines @@
 }
 
 RespondWithObserver::RespondWithObserver(ExecutionContext* context, int eventID)
     : ContextLifecycleObserver(context)
     , m_eventID(eventID)
     , m_state(Initial)
 {
 }
 
 } // namespace blink