QmlJsEditor: remove empty function

Change-Id: Ifc694394ebde336de0b7d1492dedf840c9e9a8dd
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>

src/plugins/qmljseditor/qmljseditor.h

@@ -142,7 +142,6 @@ private slots:
     void updateOutlineIndexNow();
     void updateCursorPositionNow();
     void showTextMarker();
-    void updateFileName();
 
     void updateUses();
     void updateUsesNow();