Wrapped deprecated constants in #ifndef VTK_LEGACY_REMOVE

The comments say they are deprecated,
and they are unused in the codebase.

Change-Id: I88d85fabb3ef16f2980877af21380fd8694dc321
Put RenderString() in VTK_LEGACY

The comments say its deprecated, put it in
VTK_LEGACY.  API seems unused in VTK itself.

Change-Id: If043e635408a89b01a1186307e9fa8c2dd627d71
Put SetScalars() in VTK_LEGACY

The comments say its deprecated, put it in
VTK_LEGACY.  API seems unused in VTK itself.

Change-Id: Ic619f1c8cdc75c255addb2d3da9a873808b451eb
Stop using deprecated variant of GetPixelInformation

Replace it with non-deprecated version.

Change-Id: Ia8392b395a0140796b6340a6724bf09f0a1263d4
Put GetPixelInformation() variant in VTK_LEGACY

The comments say its deprecated, put it in
VTK_LEGACY.

Previous commit updated VTK's own usage to
the non-deprecated variants.

Change-Id: I05b2e575bb03179b35d26d7439076674107195ae
Merge topic 'missing-VTK_LEGACY' into master

b78f8054 Put GetPixelInformation() variant in VTK_LEGACY
6f8741a8 Stop using deprecated variant of GetPixelInformation
4049603d Put SetScalars() in VTK_LEGACY
ac24b781 Put RenderString() in VTK_LEGACY
5c29b2ca Wrapped deprecated constants in #ifndef VTK_LEGACY_REMOVE