Revert of [builtins] Also migrate String.prototype.toLowerCase/toUpperCase to C++.

src/js/i18n.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // ECMAScript 402 API implementation.
 
 /**
  * Intl object is a single object that has some named properties,
  * all of which are constructors.
  */
@@ skipping 28 matching lines @@
 var ObjectHasOwnProperty = utils.ImportNow("ObjectHasOwnProperty");
 var OverrideFunction = utils.OverrideFunction;
 var patternSymbol = utils.ImportNow("intl_pattern_symbol");
 var resolvedSymbol = utils.ImportNow("intl_resolved_symbol");
 var SetFunctionName = utils.SetFunctionName;
 var StringIndexOf;
 var StringLastIndexOf;
 var StringSplit;
 var StringSubstr;
 var StringSubstring;
-var StringToLowerCase = GlobalString.prototype.toLowerCase;
-var StringToUpperCase = GlobalString.prototype.toUpperCase;
 
 utils.Import(function(from) {
   ArrayIndexOf = from.ArrayIndexOf;
   ArrayJoin = from.ArrayJoin;
   ArrayPush = from.ArrayPush;
   IsFinite = from.IsFinite;
   IsNaN = from.IsNaN;
   MakeError = from.MakeError;
   MakeRangeError = from.MakeRangeError;
   MakeTypeError = from.MakeTypeError;
@@ skipping 627 matching lines @@
   if (!IS_UNDEFINED(value)) {
     defineWECProperty(object, property, value);
   }
 }
 
 
 /**
  * Returns titlecased word, aMeRricA -> America.
  */
 function toTitleCaseWord(word) {
-  return %_Call(StringToUpperCase, %_Call(StringSubstr, word, 0, 1)) +
-         %_Call(StringToLowerCase, %_Call(StringSubstr, word, 1));
+  return %StringToUpperCase(%_Call(StringSubstr, word, 0, 1)) +
+         %StringToLowerCase(%_Call(StringSubstr, word, 1));
 }
 
 /**
  * Returns titlecased location, bueNos_airES -> Buenos_Aires
  * or ho_cHi_minH -> Ho_Chi_Minh. It is locale-agnostic and only
  * deals with ASCII only characters.
  * 'of', 'au' and 'es' are special-cased and lowercased.
  */
 function toTitleCaseTimezoneLocation(location) {
   var match = InternalRegExpMatch(GetTimezoneNameLocationPartRE(), location)
   if (IS_NULL(match)) throw MakeRangeError(kExpectedLocation, location);
 
   var result = toTitleCaseWord(match[1]);
   if (!IS_UNDEFINED(match[2]) && 2 < match.length) {
     // The first character is a separator, '_' or '-'.
     // None of IANA zone names has both '_' and '-'.
     var separator = %_Call(StringSubstring, match[2], 0, 1);
     var parts = %_Call(StringSplit, match[2], separator);
     for (var i = 1; i < parts.length; i++) {
       var part = parts[i]
-      var lowercasedPart = %_Call(StringToLowerCase, part);
+      var lowercasedPart = %StringToLowerCase(part);
       result = result + separator +
           ((lowercasedPart !== 'es' &&
             lowercasedPart !== 'of' && lowercasedPart !== 'au') ?
           toTitleCaseWord(part) : lowercasedPart);
     }
   }
   return result;
 }
 
 /**
@@ skipping 419 matching lines @@
     throw MakeRangeError(kInvalidCurrencyCode, currency);
   }
 
   if (internalOptions.style === 'currency' && IS_UNDEFINED(currency)) {
     throw MakeTypeError(kCurrencyCode);
   }
 
   var currencyDisplay = getOption(
       'currencyDisplay', 'string', ['code', 'symbol', 'name'], 'symbol');
   if (internalOptions.style === 'currency') {
-    defineWEProperty(internalOptions, 'currency',
-                     %_Call(StringToUpperCase, currency));
+    defineWEProperty(internalOptions, 'currency', %StringToUpperCase(currency));
     defineWEProperty(internalOptions, 'currencyDisplay', currencyDisplay);
   }
 
   // Digit ranges.
   var mnid = getNumberOption(options, 'minimumIntegerDigits', 1, 21, 1);
   defineWEProperty(internalOptions, 'minimumIntegerDigits', mnid);
 
   var mnfd = options['minimumFractionDigits'];
   var mxfd = options['maximumFractionDigits'];
   if (!IS_UNDEFINED(mnfd) || internalOptions.style !== 'currency') {
@@ skipping 613 matching lines @@
  * Returns canonical Area/Location(/Location) name, or throws an exception
  * if the zone name is invalid IANA name.
  */
 function canonicalizeTimeZoneID(tzID) {
   // Skip undefined zones.
   if (IS_UNDEFINED(tzID)) {
     return tzID;
   }
 
   // Special case handling (UTC, GMT).
-  var upperID = %_Call(StringToUpperCase, tzID);
+  var upperID = %StringToUpperCase(tzID);
   if (upperID === 'UTC' || upperID === 'GMT' ||
       upperID === 'ETC/UTC' || upperID === 'ETC/GMT') {
     return 'UTC';
   }
 
   // TODO(jshin): Add support for Etc/GMT[+-]([1-9]|1[0-2])
 
   // We expect only _, '-' and / beside ASCII letters.
   // All inputs should conform to Area/Location(/Location)* from now on.
   var match = InternalRegExpMatch(GetTimezoneNameCheckRE(), tzID);
@@ skipping 449 matching lines @@
   }
 );
 
 utils.Export(function(to) {
   to.AddBoundMethod = AddBoundMethod;
   to.IntlParseDate = IntlParseDate;
   to.IntlParseNumber = IntlParseNumber;
 });
 
 })