Remove --harmony-scoping flag.

src/messages.js

Index: src/messages.js
diff --git a/src/messages.js b/src/messages.js
index 62429cfd2fd57252f1ebaab04043dcf32b5550c1..3a8590b2b1bbdd076c5c99c0af843b762380a425 100644
--- a/src/messages.js
+++ b/src/messages.js
@@ -156,7 +156,6 @@ var kMessages = {
   template_octal_literal:        ["Octal literals are not allowed in template strings."],
   strict_delete:                 ["Delete of an unqualified identifier in strict mode."],
   strict_delete_property:        ["Cannot delete property '", "%0", "' of ", "%1"],
-  strict_const:                  ["Use of const in strict mode."],
   strict_function:               ["In strict mode code, functions can only be declared at top level or immediately within another function." ],
   strict_read_only_property:     ["Cannot assign to read only property '", "%0", "' of ", "%1"],
   strict_cannot_assign:          ["Cannot assign to read only '", "%0", "' in strict mode"],