clean up colorfilter sprite blitters

Instead of rejecting all sprite blitters when there's a color filter,
just remove the old legacy color filter sprite blitters.  The
SkRasterPipelineSpriteBlitter can still handle color filters... no need
to fall back to the general shader (gather) blitter.

Change-Id: Ib27f3e153612d0d904093da68223c2b862b17f63
Reviewed-on: https://skia-review.googlesource.com/21204
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Reed <reed@google.com>
2 files changed