QmlDesigner: Remove unused code

Change-Id: I5c74437bf2ba9dad06b452c58286a5168e6f392e
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmldesigner/components/navigator/navigatortreemodel.cpp

@@ -106,11 +106,6 @@ static bool isRootNodeOrAcceptedChild(const ModelNode &modelNode)
     return modelNode.isRootNode() || acceptedModelNodeChildren(modelNode.parentProperty().parentModelNode()).contains(modelNode);
 }
 
-static bool nodeCanBeHandled(const ModelNode &modelNode)
-{
-    return modelNode.metaInfo().isGraphicalItem() && isRootNodeOrAcceptedChild(modelNode);
-}
-
 static void removePosition(const ModelNode &node)
 {
     ModelNode modelNode = node;