Reapply r9192 and 9194, with the change of making locale a public field.

lib/i18n/bidi_formatter.dart

Index: lib/i18n/bidi_formatter.dart
===================================================================
--- lib/i18n/bidi_formatter.dart	(revision 9195)
+++ lib/i18n/bidi_formatter.dart	(working copy)
@@ -2,13 +2,9 @@
 // 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_formatter');
-
-#import('bidi_utils.dart');
-
 /**
  * Bidi stands for Bi-directional text.
- * According to http://en.wikipedia.org/wiki/Bi-directional_text:
+ * According to [Wikipedia](http://en.wikipedia.org/wiki/Bi-directional_text):
  * Bi-directional text is text containing text in both text directionalities,
  * both right-to-left (RTL) and left-to-right (LTR). It generally involves text
  * containing different types of alphabets, but may also refer to boustrophedon,
@@ -57,8 +53,6 @@
  * then up to the caller to insert the return value in the output.
  */
 
-#import('dart:web');
-
 class BidiFormatter {
 
   /** The direction of the surrounding text (the context). */