COMP: Fix warning about inlines reference before definition.

The mingw-gcc-4.5 dashboard was displaying warnings because some
methods were being used before they were defined as inline methods,
the precise warning was that the method was "redeclared without
dllimport attribute after being referenced with dll linkage."
Rearranging the order in which the methods are defined fixes this.

Change-Id: Ica6b03c785f79c1ed35d95fdd5c7881a0563ac9e
Merge topic 'vtkPixelExtent-inlines' into master

ca37fcb7 COMP: Fix warning about inlines reference before definition.