Remove deprecated method from new class.

I'm pretty sure I've caught all uses of deprecated methods throughout
the Qt codebase, except for the ItemViews changes and for QtWebKit
(which must still compile with Qt 4).

Change-Id: Ic17801b71434fa41c647f97c9e5e4234ad4f9af0
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

src/gui/kernel/qguiapplication.h

@@ -94,9 +94,6 @@ public:
 
     static QWindow *modalWindow();
 
-#if QT_DEPRECATED_SINCE(5, 0)
-    static QT_DEPRECATED QWindow *activeWindow() { return focusWindow(); }
-#endif
     static QWindow *focusWindow();
     static QObject *focusObject();