Use [ImplementedAs=domWindow] for Document.defaultView()

Source/core/dom/NamedFlow.cpp

Index: Source/core/dom/NamedFlow.cpp
diff --git a/Source/core/dom/NamedFlow.cpp b/Source/core/dom/NamedFlow.cpp
index 6fb918c9593dace4f6f96358ad0795cfe6f4befe..575fd13eef6c830d0a16f6f273e82bbbf0eda803 100644
--- a/Source/core/dom/NamedFlow.cpp
+++ b/Source/core/dom/NamedFlow.cpp
@@ -212,7 +212,7 @@ void NamedFlow::dispatchRegionLayoutUpdateEvent()
     if (flowState() == FlowStateNull)
         return;
 
-    RefPtr<Event> event = UIEvent::create(EventTypeNames::webkitregionlayoutupdate, false, false, m_flowManager->document()->defaultView(), 0);
+    RefPtr<Event> event = UIEvent::create(EventTypeNames::webkitregionlayoutupdate, false, false, m_flowManager->document()->domWindow(), 0);
 
     dispatchEvent(event);
 }
@@ -225,7 +225,7 @@ void NamedFlow::dispatchRegionOversetChangeEvent()
     if (flowState() == FlowStateNull)
         return;
 
-    RefPtr<Event> event = UIEvent::create(EventTypeNames::webkitregionoversetchange, false, false, m_flowManager->document()->defaultView(), 0);
+    RefPtr<Event> event = UIEvent::create(EventTypeNames::webkitregionoversetchange, false, false, m_flowManager->document()->domWindow(), 0);
 
     dispatchEvent(event);
 }