Make error messages for cross-domain access OOPIF-friendly.

Source/core/frame/RemoteDOMWindow.cpp

Index: Source/core/frame/RemoteDOMWindow.cpp
diff --git a/Source/core/frame/RemoteDOMWindow.cpp b/Source/core/frame/RemoteDOMWindow.cpp
index f803bb492347b6f5a162b943b7fc78f8ce6eb056..f677294eb26c88e31b8ab85506ac96cbda1b8a3d 100644
--- a/Source/core/frame/RemoteDOMWindow.cpp
+++ b/Source/core/frame/RemoteDOMWindow.cpp
@@ -344,16 +344,6 @@ void RemoteDOMWindow::cancelAnimationFrame(int id)
     ASSERT_NOT_REACHED();
 }
 
-String RemoteDOMWindow::sanitizedCrossDomainAccessErrorMessage(LocalDOMWindow* callingWindow)
-{
-    return String();
-}
-
-String RemoteDOMWindow::crossDomainAccessErrorMessage(LocalDOMWindow* callingWindow)
-{
-    return String();
-}
-
 RemoteDOMWindow::RemoteDOMWindow(RemoteFrame& frame)
     : m_frame(&frame)
 {