Remove SANITIZE_THIS
diff --git a/src/hb-open-type-private.hh b/src/hb-open-type-private.hh
index 82f92c1..75a539b 100644
--- a/src/hb-open-type-private.hh
+++ b/src/hb-open-type-private.hh
@@ -229,8 +229,7 @@
 
 #define SANITIZE(X) likely ((X).sanitize (SANITIZE_ARG))
 
-#define SANITIZE_THIS(X) likely ((X).sanitize (SANITIZE_ARG, CharP(this)))
-#define SANITIZE_WITH_BASE(B,X) likely ((X).sanitize (SANITIZE_ARG, (B)))
+#define SANITIZE_WITH_BASE(B,X) likely ((X).sanitize (SANITIZE_ARG, CharP(B)))
 
 #define SANITIZE_SELF() SANITIZE_MEM(this, sizeof (*this))