Remove deprecated string features.

utils/testrunner/layout_test_controller.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.
 
 // The following set of variables should be set by the caller that
 // #sources this file.
 /** Whether to include elapsed time. */
 
 part of test_controller;
 
@@ skipping 214 matching lines @@
       }
     };
     stdoutStream.onError = (e) {
       print(e);
     };
     process.onExit = (exitCode) {
       stdout.addAll(process.stdout.read());
       process.close();
       var labelMarker = 'CONSOLE MESSAGE: #TEST ';
       var contentMarker = 'Content-Length: ';
-      var eol = '\n'.charCodeAt(0);
+      var eol = '\n'.codeUnitAt(0);
       var pos = -1;
       var label = null;
       var done = false;
 
       while(pos < stdout.length) {
         var idx = stdout.indexOf(eol, ++pos);
         if (idx < 0) break;
         StringBuffer sb = new StringBuffer();
         for (var i = pos; i < idx; i++) {
           sb.addCharCode(stdout[i]);
@@ skipping 67 matching lines @@
 
 void runPixelLayoutTests() {
   init();
   runPixelLayoutTest(0);
 }
 
 void runTextLayoutTests() {
   init();
   runTextLayoutTest(0);
 }