Revert of Revert of stop calling SkScalarDiv

src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp

Index: src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp
diff --git a/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp b/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp
index bc70d6bca400b99b3d59c339979fc9f7cebef73e..f7b3eb89b28af3247d65440c5523816a6102a2d8 100644
--- a/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp
+++ b/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp
@@ -357,7 +357,7 @@
 
     // Scale factor 1 / (1 - focalX * focalX)
     SkScalar oneMinusF2 = 1.f - SkScalarMul(*focalX, *focalX);
-    SkScalar s = SkScalarDiv(1.f, oneMinusF2);
+    SkScalar s = SkScalarInvert(oneMinusF2);
 
 
     if (s >= 0.f) {
@@ -1115,8 +1115,7 @@
         : INHERITED(ctx, shader, matrix, tm), fInfo(info) {
         this->initClassID<CircleOutside2PtConicalEffect>();
         if (shader.getStartRadius() != shader.getEndRadius()) {
-            fTLimit = SkScalarDiv(shader.getStartRadius(),
-                                  (shader.getStartRadius() - shader.getEndRadius()));
+            fTLimit = shader.getStartRadius() / (shader.getStartRadius() - shader.getEndRadius());
         } else {
             fTLimit = SK_ScalarMin;
         }