debugger: Remove dead code

Change-Id: Id59c9df315f7b19cd8a705e4283e749fb71b4dce
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/debuggermainwindow.h

@@ -86,9 +86,6 @@ public:
 private slots:
     void raiseDebuggerWindow();
 
-signals:
-    void activeDebugLanguagesChanged(Debugger::DebuggerLanguages);
-
 private:
     friend class Internal::DebuggerMainWindowPrivate;
     Internal::DebuggerMainWindowPrivate *d;