Cleanup unused clear_vars.mk entry.

Change-Id: Ibd7b87d1364a60289609a267a287c4afa1d5e5cb
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 21b8294..e352cc5 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -150,7 +150,6 @@
 LOCAL_CTS_TEST_PACKAGE:=
 LOCAL_CTS_TEST_RUNNER:=
 LOCAL_CLANG:=
-LOCAL_ADDRESS_SANITIZER:=
 LOCAL_DETECT_INTEGER_OVERFLOWS:=
 LOCAL_JAR_EXCLUDE_FILES:=
 LOCAL_JAR_PACKAGES:=