Revert of Revert of stop calling SkScalarDiv

src/core/SkScalar.cpp

Index: src/core/SkScalar.cpp
diff --git a/src/core/SkScalar.cpp b/src/core/SkScalar.cpp
index c48d3890ad8adfe63014c04c018dea06f9fc4429..e8f6e9334839cd284add40616e81ea2d2d34e886 100644
--- a/src/core/SkScalar.cpp
+++ b/src/core/SkScalar.cpp
@@ -31,6 +31,6 @@
     // Otherwise, interpolate between right - 1 and right.
     SkScalar rightKey = keys[right];
     SkScalar leftKey = keys[right-1];
-    SkScalar fract = SkScalarDiv(searchKey-leftKey,rightKey-leftKey);
+    SkScalar fract = (searchKey - leftKey) / (rightKey - leftKey);
     return SkScalarInterp(values[right-1], values[right], fract);
 }