Simple cleanups related to SkFixed.

src/effects/gradients/SkTwoPointConicalGradient.h

Index: src/effects/gradients/SkTwoPointConicalGradient.h
diff --git a/src/effects/gradients/SkTwoPointConicalGradient.h b/src/effects/gradients/SkTwoPointConicalGradient.h
index 117e6e967da0d0c44a78740bf2dd6559c2e0fc0b..35ba3405a663dffa21e196c17ec2019287a6cb50 100644
--- a/src/effects/gradients/SkTwoPointConicalGradient.h
+++ b/src/effects/gradients/SkTwoPointConicalGradient.h
@@ -15,7 +15,7 @@
 // Should only be initialized once via init(). Immutable afterwards.
 struct TwoPtRadial {
     enum {
-        kDontDrawT  = 0x80000000
+        kDontDrawT  = SK_FixedMin
     };
 
     float   fCenterX, fCenterY;