Remove deprecated string features.

tests/standalone/io/string_transformer_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.
 
 import "dart:async";
 import "dart:io";
 import "dart:isolate";
 import "dart:utf";
 
 void testUtf8() {
@@ skipping 96 matching lines @@
   }
 
   void streamClosed() {
     Expect.equals(2, stage);
   }
 
   stream.listen(
       stringData,
       onDone: streamClosed);
 
-  controller.add("Line".charCodes);
+  controller.add("Line".codeUnits);
 }
 
 void testReadLine2() {
   var controller = new StreamController();
 
   var stream = controller.stream
     .transform(new StringDecoder())
     .transform(new LineTransformer());
 
   var stage = 0;
   var subStage = 0;
   stream.listen((line) {
       if (stage == 0) {
         if (subStage == 0) {
           Expect.equals("Line1", line);
           subStage++;
         } else if (subStage == 1) {
           Expect.equals("Line2", line);
           subStage++;
         } else if (subStage == 2) {
           Expect.equals("Line3", line);
           subStage = 0;
           stage++;
-          controller.add("ne4\n".charCodes);
+          controller.add("ne4\n".codeUnits);
         } else {
           Expect.fail("Stage 0 failed");
         }
       } else if (stage == 1) {
         if (subStage == 0) {
           Expect.equals("Line4", line);
           subStage = 0;
           stage++;
-          controller.add("\n\n\r\n\r\n\r\r".charCodes);
+          controller.add("\n\n\r\n\r\n\r\r".codeUnits);
         } else {
           Expect.fail("Stage 1 failed");
         }
       } else if (stage == 2) {
         if (subStage < 4) {
           // Expect 5 empty lines. As long as the stream is not closed the
           // final \r cannot be interpreted as a end of line.
           Expect.equals("", line);
           subStage++;
         } else if (subStage == 4) {
@@ skipping 10 matching lines @@
           stage++;
         } else {
           Expect.fail("Stage 3 failed");
         }
       }
     }, onDone: () {
       Expect.equals(4, stage);
       Expect.equals(0, subStage);
     });
 
-  controller.add("Line1\nLine2\r\nLine3\rLi".charCodes);
+  controller.add("Line1\nLine2\r\nLine3\rLi".codeUnits);
 }
 
 class TestException implements Exception {
   TestException();
 }
 
 testErrorHandler() {
   var controller = new StreamController();
   var errors = 0;
   var stream = controller.stream
@@ skipping 37 matching lines @@
 
 main() {
   testUtf8();
   testLatin1();
   testAscii();
   testReadLine1();
   testReadLine2();
   testErrorHandler();
   testLatin1EncoderError();
 }