Remove GrCoordTransform::kPosition_CoordSet

Review URL: https://codereview.chromium.org/811373002
diff --git a/src/gpu/effects/GrSimpleTextureEffect.cpp b/src/gpu/effects/GrSimpleTextureEffect.cpp
index 51822e9..93f7d68 100644
--- a/src/gpu/effects/GrSimpleTextureEffect.cpp
+++ b/src/gpu/effects/GrSimpleTextureEffect.cpp
@@ -76,7 +76,7 @@
 
     static const GrCoordSet kCoordSets[] = {
         kLocal_GrCoordSet,
-        kPosition_GrCoordSet
+        kDevice_GrCoordSet
     };
     GrCoordSet coordSet = kCoordSets[random->nextULessThan(SK_ARRAY_COUNT(kCoordSets))];