BUGFIX: Encapsulate class definition in #ifndef
BUGFIX: Encapsulate class definition in #ifndef

Encapsulate the class definition in #ifndef clause to resolve compilation
issue with multiple header inclusion.

Change-Id: Ia33a0e570ab36e23c1c981a9b487369ac78d1774

ashray/VTK-EVM,cjh1/VTK,biddisco/VTK,msmolens/VTK,cjh1/VTK,ashray/VTK-EVM,cjh1/VTK,ashray/VTK-EVM,biddisco/VTK,demarle/VTK,mspark93/VTK,johnkit/vtk-dev,ashray/VTK-EVM,sankhesh/VTK,jmerkow/VTK,candy7393/VTK,collects/VTK,biddisco/VTK,candy7393/VTK,aashish24/VTK-old,johnkit/vtk-dev,sankhesh/VTK,SimVascular/VTK,SimVascular/VTK,collects/VTK,msmolens/VTK,msmolens/VTK,keithroe/vtkoptix,msmolens/VTK,collects/VTK,sumedhasingla/VTK,berendkleinhaneveld/VTK,cjh1/VTK,keithroe/vtkoptix,sankhesh/VTK,hendradarwin/VTK,sumedhasingla/VTK,biddisco/VTK,gram526/VTK,candy7393/VTK,collects/VTK,sumedhasingla/VTK,mspark93/VTK,gram526/VTK,keithroe/vtkoptix,sankhesh/VTK,ashray/VTK-EVM,candy7393/VTK,ashray/VTK-EVM,mspark93/VTK,collects/VTK,demarle/VTK,msmolens/VTK,collects/VTK,jmerkow/VTK,candy7393/VTK,ashray/VTK-EVM,jmerkow/VTK,candy7393/VTK,hendradarwin/VTK,berendkleinhaneveld/VTK,SimVascular/VTK,hendradarwin/VTK,keithroe/vtkoptix,aashish24/VTK-old,johnkit/vtk-dev,gram526/VTK,candy7393/VTK,gram526/VTK,aashish24/VTK-old,aashish24/VTK-old,hendradarwin/VTK,msmolens/VTK,SimVascular/VTK,demarle/VTK,sankhesh/VTK,johnkit/vtk-dev,sankhesh/VTK,johnkit/vtk-dev,demarle/VTK,demarle/VTK,berendkleinhaneveld/VTK,berendkleinhaneveld/VTK,sumedhasingla/VTK,mspark93/VTK,biddisco/VTK,mspark93/VTK,hendradarwin/VTK,aashish24/VTK-old,cjh1/VTK,SimVascular/VTK,demarle/VTK,jmerkow/VTK,jmerkow/VTK,biddisco/VTK,gram526/VTK,demarle/VTK,msmolens/VTK,ashray/VTK-EVM,mspark93/VTK,SimVascular/VTK,gram526/VTK,sankhesh/VTK,SimVascular/VTK,keithroe/vtkoptix,cjh1/VTK,keithroe/vtkoptix,candy7393/VTK,mspark93/VTK,keithroe/vtkoptix,gram526/VTK,berendkleinhaneveld/VTK,SimVascular/VTK,sumedhasingla/VTK,johnkit/vtk-dev,keithroe/vtkoptix,demarle/VTK,jmerkow/VTK,biddisco/VTK,jmerkow/VTK,sankhesh/VTK,sumedhasingla/VTK,gram526/VTK,hendradarwin/VTK,mspark93/VTK,msmolens/VTK,jmerkow/VTK,berendkleinhaneveld/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,hendradarwin/VTK,aashish24/VTK-old,sumedhasingla/VTK,sumedhasingla/VTK