remove unused code

src/pathops/SkPathOpsLine.h

Index: src/pathops/SkPathOpsLine.h
diff --git a/src/pathops/SkPathOpsLine.h b/src/pathops/SkPathOpsLine.h
index ce502019ae4c5e29a9bcc644d5c1606732d09d83..882dadc1f8b5482dadcf2fb3f5b1498df07a5298 100644
--- a/src/pathops/SkPathOpsLine.h
+++ b/src/pathops/SkPathOpsLine.h
@@ -25,9 +25,6 @@ struct SkDLine {
     static double ExactPointH(const SkDPoint& xy, double left, double right, double y);
     static double ExactPointV(const SkDPoint& xy, double top, double bottom, double x);
 
-    // only used by testing
-    double isLeft(const SkDPoint& pt) const;
-
     double nearPoint(const SkDPoint& xy, bool* unequal) const;
     bool nearRay(const SkDPoint& xy) const;
     static double NearPointH(const SkDPoint& xy, double left, double right, double y);