Revert of [builtins] Move StringNormalize to a cpp builtin.

src/js/string.js

Index: src/js/string.js
diff --git a/src/js/string.js b/src/js/string.js
index 00fee68ac9fc6d02598c212d89f9af54d135b84a..38caab7b125d1adbe25957d474250faa46eb6f59 100644
--- a/src/js/string.js
+++ b/src/js/string.js
@@ -116,6 +116,30 @@
   RegExpInitialize(regexp, pattern);
   return regexp[matchSymbol](subject);
 }
+
+
+// ECMA-262 v6, section 21.1.3.12
+//
+// For now we do nothing, as proper normalization requires big tables.
+// If Intl is enabled, then i18n.js will override it and provide the the
+// proper functionality.
+function StringNormalize(formArg) {  // length == 0
+  CHECK_OBJECT_COERCIBLE(this, "String.prototype.normalize");
+  var s = TO_STRING(this);
+
+  var form = IS_UNDEFINED(formArg) ? 'NFC' : TO_STRING(formArg);
+
+  var NORMALIZATION_FORMS = ['NFC', 'NFD', 'NFKC', 'NFKD'];
+  var normalizationForm = %ArrayIndexOf(NORMALIZATION_FORMS, form, 0);
+  if (normalizationForm === -1) {
+    throw %make_range_error(kNormalizationForm,
+                         %_Call(ArrayJoin, NORMALIZATION_FORMS, ', '));
+  }
+
+  return s;
+}
+
+%FunctionSetLength(StringNormalize, 0);
 
 
 // This has the same size as the RegExpLastMatchInfo array, and can be used
@@ -716,6 +740,7 @@
   "lastIndexOf", StringLastIndexOf,
   "localeCompare", StringLocaleCompareJS,
   "match", StringMatchJS,
+  "normalize", StringNormalize,
   "repeat", StringRepeat,
   "replace", StringReplace,
   "search", StringSearch,