Rework dispatchEvent so it is consistent for isTrusted support.

Source/core/dom/Node.h

Index: Source/core/dom/Node.h
diff --git a/Source/core/dom/Node.h b/Source/core/dom/Node.h
index 0919deb607835993c907a8db504f70bf57ac740b..462eb615dff2b75f9fb0daf755e881d0b3e793cf 100644
--- a/Source/core/dom/Node.h
+++ b/Source/core/dom/Node.h
@@ -623,9 +623,6 @@ public:
     virtual void* preDispatchEventHandler(Event*) { return nullptr; }
     virtual void postDispatchEventHandler(Event*, void* /*dataFromPreDispatch*/) { }
 
-    using EventTarget::dispatchEvent;
-    bool dispatchEvent(PassRefPtrWillBeRawPtr<Event>) override;
-
     void dispatchScopedEvent(PassRefPtrWillBeRawPtr<Event>);
     void dispatchScopedEventDispatchMediator(PassRefPtrWillBeRawPtr<EventDispatchMediator>);
 
@@ -753,6 +750,8 @@ protected:
 
     virtual void didMoveToNewDocument(Document& oldDocument);
 
+    bool dispatchEventInternal(PassRefPtrWillBeRawPtr<Event>) override;
+
     static void reattachWhitespaceSiblingsIfNeeded(Text* start);
 
 #if !ENABLE(OILPAN)