COMP: vtkCocoaRenderWindow.mm fails to compile

The recent changes to vtkCocoaRenderWindow.mm fail to compile.
Missing closing }.

Change-Id: I76d36aa57448cd1d12b83554b917e878ef1e0eca
Merge topic 'SyntaxError_vtkCocoaRenderWindow' into master

fd867793 COMP: vtkCocoaRenderWindow.mm fails to compile