Revert of Revert of stop calling SkScalarDiv

src/gpu/GrAAConvexPathRenderer.cpp

Index: src/gpu/GrAAConvexPathRenderer.cpp
diff --git a/src/gpu/GrAAConvexPathRenderer.cpp b/src/gpu/GrAAConvexPathRenderer.cpp
index d536823a5a857971e72dcabeb2d2fb56ae521a11..9b3183f30daeb7b82b7ce57ff571aa8849a99e2e 100644
--- a/src/gpu/GrAAConvexPathRenderer.cpp
+++ b/src/gpu/GrAAConvexPathRenderer.cpp
@@ -104,7 +104,7 @@
         *c = avg;
     } else {
         area *= 3;
-        area = SkScalarDiv(SK_Scalar1, area);
+        area = SkScalarInvert(area);
         center.fX = SkScalarMul(center.fX, area);
         center.fY = SkScalarMul(center.fY, area);
         // undo the translate of p0 to the origin.