Service Worker: Correct Web IDL of ExtendableEvent.waitUntil method.

Source/modules/serviceworkers/WaitUntilObserver.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/WaitUntilObserver.h"
 
 #include "bindings/core/v8/ScriptFunction.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptValue.h"
@@ skipping 89 matching lines @@
 }
 
 void WaitUntilObserver::didDispatchEvent(bool errorOccurred)
 {
     if (errorOccurred)
         m_hasError = true;
     decrementPendingActivity();
     m_eventDispatched = true;
 }
 
-void WaitUntilObserver::waitUntil(ScriptState* scriptState, const ScriptValue& value, ExceptionState& exceptionState)
+void WaitUntilObserver::waitUntil(ScriptState* scriptState, ScriptPromise scriptPromise, ExceptionState& exceptionState)
 {
     if (m_eventDispatched) {
         exceptionState.throwDOMException(InvalidStateError, "The event handler is already finished.");
         return;
     }
 
     if (!executionContext())
         return;
 
     // When handling a notificationclick event, we want to allow one window to
     // be focused or opened. See comments in ::willDispatchEvent(). When
     // waitUntil() is being used, opening or closing a window must happen in a
     // timeframe specified by windowInteractionTimeout(), otherwise the calls
     // will fail.
     if (m_type == NotificationClick)
         m_consumeWindowInteractionTimer.startOneShot(windowInteractionTimeout(), FROM_HERE);
 
     incrementPendingActivity();
-    ScriptPromise::cast(scriptState, value).then(
+    scriptPromise.then(
         ThenFunction::createFunction(scriptState, this, ThenFunction::Fulfilled),
         ThenFunction::createFunction(scriptState, this, ThenFunction::Rejected));
 }
 
 WaitUntilObserver::WaitUntilObserver(ExecutionContext* context, EventType type, int eventID)
     : ContextLifecycleObserver(context)
     , m_type(type)
     , m_eventID(eventID)
     , m_pendingActivity(0)
     , m_hasError(false)
@@ skipping 51 matching lines @@
         return;
     executionContext()->consumeWindowInteraction();
 }
 
 DEFINE_TRACE(WaitUntilObserver)
 {
     ContextLifecycleObserver::trace(visitor);
 }
 
 } // namespace blink