Rename CastException to CastError.

lib/core/errors.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.
 
 class Error {
   const Error();
 }
 
 class AssertionError implements Error {
 }
 
 class TypeError implements AssertionError {
 }
 
-// TODO(lrn): Rename to CastError according to specification.
-class CastException implements Error {
+class CastError implements Error {
 }
 
 /**
  * Error thrown when a function is passed an unacceptable argument.
  */
 class ArgumentError implements Error {
   final message;
 
   /** The [message] describes the erroneous argument. */
   const ArgumentError([this.message = ""]);
@@ skipping 93 matching lines @@
         .replaceAll('\n', '${backslash}n')
         .replaceAll('\r', '${backslash}r')
         .replaceAll('"',  '$backslash"');
       return '"$escaped"';
     }
     return _objectToString(object);
   }
 
   external static _objectToString(Object object);
 }