remove unused SkCubicInterval

include/utils/SkCubicInterval.h

Index: include/utils/SkCubicInterval.h
diff --git a/include/utils/SkCubicInterval.h b/include/utils/SkCubicInterval.h
deleted file mode 100644
index 64d63cf2cdba84e2cf494ffb0ebdab7babc48615..0000000000000000000000000000000000000000
--- a/include/utils/SkCubicInterval.h
+++ /dev/null
@@ -1,22 +0,0 @@
-
-/*
- * Copyright 2011 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#ifndef SkCubicInterval_DEFINED
-#define SkCubicInterval_DEFINED
-
-#include "SkPoint.h"
-
-SkScalar SkEvalCubicInterval(SkScalar x1, SkScalar y1,
-                             SkScalar x2, SkScalar y2,
-                             SkScalar unitX);
-
-static inline SkScalar SkEvalCubicInterval(const SkPoint pts[2], SkScalar x) {
-    return SkEvalCubicInterval(pts[0].fX, pts[0].fY,
-                               pts[1].fX, pts[1].fY, x);
-}
-
-#endif