Rework dispatchEvent so it is consistent for isTrusted support.

Source/modules/serviceworkers/ServiceWorkerGlobalScope.cpp

 /*
  * 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 171 matching lines @@
         }
     }
     return WorkerGlobalScope::addEventListener(eventType, listener, useCapture);
 }
 
 const AtomicString& ServiceWorkerGlobalScope::interfaceName() const
 {
     return EventTargetNames::ServiceWorkerGlobalScope;
 }
 
-bool ServiceWorkerGlobalScope::dispatchEvent(PassRefPtrWillBeRawPtr<Event> event)
+bool ServiceWorkerGlobalScope::dispatchEventInternal(PassRefPtrWillBeRawPtr<Event> event)
 {
     m_eventNestingLevel++;
-    bool result = WorkerGlobalScope::dispatchEvent(event.get());
+    bool result = WorkerGlobalScope::dispatchEventInternal(event.get());
     if (event->interfaceName() == EventNames::ErrorEvent && m_eventNestingLevel == 2 && !event->defaultPrevented())
         m_hadErrorInTopLevelEventHandler = true;
     m_eventNestingLevel--;
     return result;
 }
 
 void ServiceWorkerGlobalScope::dispatchExtendableEvent(PassRefPtrWillBeRawPtr<Event> event, WaitUntilObserver* observer)
 {
     ASSERT(m_eventNestingLevel == 0);
     m_hadErrorInTopLevelEventHandler = false;
@@ skipping 38 matching lines @@
 }
 
 void ServiceWorkerGlobalScope::scriptLoaded(size_t scriptSize, size_t cachedMetadataSize)
 {
     ++m_scriptCount;
     m_scriptTotalSize += scriptSize;
     m_scriptCachedMetadataTotalSize += cachedMetadataSize;
 }
 
 } // namespace blink