Get rid of BidiUtils as a class holding only static methods. I was reminded by

tests/lib/i18n/bidi_format_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 #library('bidi_format_test');
 
 #import('../../../lib/i18n/intl.dart');
 #import('../../../lib/unittest/unittest.dart');
 
 /**
  * Tests the bidirectional text formatting library.
  */
 main() {
-  var LRM = BidiUtils.LRM;
-  var RLM = BidiUtils.RLM;
-  var LRE = BidiUtils.LRE;
-  var RLE = BidiUtils.RLE;
-  var PDF = BidiUtils.PDF;
   var LTR = TextDirection.LTR;
   var RTL = TextDirection.RTL;
   var UNKNOWN = TextDirection.UNKNOWN;
   var he = '\u05e0\u05e1';
   var en = 'abba';
   var html = '<';
   var longEn = 'abba sabba gabba ';
   var longHe = '\u05e0 \u05e1 \u05e0 ';
   var ltrFmt = new BidiFormatter.LTR();  // LTR context
   var rtlFmt = new BidiFormatter.RTL();  // RTL context
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     expect(rtlFmt.wrapWithUnicode(he, direction : TextDirection.LTR),
         equals('$LRE$he$PDF$RLM'));
     // Test supposed overall dir (LTR) doesn't match context dir (unknown).
     expect(unkFmt.wrapWithUnicode(he, direction : TextDirection.LTR),
         equals('$LRE$he$PDF'));
     // Test supposed overall dir (neutral) doesn't match context dir (LTR).
     expect(ltrFmt.wrapWithUnicode(he, direction : TextDirection.UNKNOWN),
         equals('$he$LRM'));
   });
 }