Remove deprecated string features.

editor/tools/plugins/com.google.dart.tools.core_test/src/com/google/dart/tools/core/internal/model/testsource/CoreRuntimeTypesTest.dart

 // Copyright (c) 2011, 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.
 
 /**
  * A test of simple runtime behavior on numbers, strings and arrays with
  * a focus on both correct behavior and runtime errors.
  *
  * This file is written to use minimal type declarations to match a
  * typical dynamic language coding style.
@@ skipping 129 matching lines @@
     assertEquals(y.isEven, false);
     assertEquals(y.isOdd, true);
     assertEquals(y.toRadixString(2), '1001');
     assertEquals(y.toRadixString(3), '100');
     assertEquals(y.toRadixString(16), '9');
   }
 
   static testStringOperators() {
     var s = "abcdef";
     assertEquals(s, "abcdef");
-    assertEquals(s.charCodeAt(0), 97);
+    assertEquals(s.codeUnitAt(0), 97);
     assertEquals(s[0], 'a');
     assertEquals(s.length, 6);
     assertTypeError(function() { s[null]; });
     assertTypeError(function() { s['hello']; });
     assertTypeError(function() { s[0] = 'x'; });
   }
 
   // TODO(jimhug): Fill out full set of string methods.
   static testStringMethods() {
     var s = "abcdef";
@@ skipping 105 matching lines @@
     .5.toString();
     1.toString();
     if (false) {
       null.toString();
     }
     '${1}'.toString();
     ''.toString();
     ''.endsWith('');
   }
 }