Extract a DOMWindow interface from LocalDOMWindow and use it in the idl.

Source/core/page/Page.cpp

Index: Source/core/page/Page.cpp
diff --git a/Source/core/page/Page.cpp b/Source/core/page/Page.cpp
index 6bb4904a9491c2fec26a2129aaad530859fa1c15..04f040ed9f350c88b405284770a5a7ae25872b74 100644
--- a/Source/core/page/Page.cpp
+++ b/Source/core/page/Page.cpp
@@ -570,7 +570,7 @@ void Page::acceptLanguagesChanged()
     }
 
     for (unsigned i = 0; i < frames.size(); ++i)
-        frames[i]->domWindow()->acceptLanguagesChanged();
+        frames[i]->localDOMWindow()->acceptLanguagesChanged();
 }
 
 PageLifecycleNotifier& Page::lifecycleNotifier()