Make String.charCodes a getter.

lib/core/string.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 String class represents character strings. Strings are
  * immutable. A string is represented by a list of 32-bit Unicode
  * scalar character codes accessible through the [charCodeAt] or the
  * [charCodes] method.
  */
@@ skipping 99 matching lines @@
   List<String> split(Pattern pattern);
 
   /**
    * Returns a list of the characters of this string.
    */
   List<String> splitChars();
 
   /**
    * Returns a list of the scalar character codes of this string.
    */
-  List<int> charCodes();
+  List<int> get charCodes;
 
   /**
    * If this string is not already all lower case, returns a new string
    * where all characters  are made lower case. Returns [:this:] otherwise.
    */
   String toLowerCase();
 
   /**
    * If this string is not already all uper case, returns a new string
    * where all characters are made upper case. Returns [:this:] otherwise.
    */
   String toUpperCase();
 }