Rename NoSuchMethodException to NoSuchMethodError.

tests/html/unknownelement_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
 
 #library('UnknownElementTest');
 #import('../../pkg/unittest/unittest.dart');
 #import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 
 main() {
@@ skipping 39 matching lines @@
           case 'bar':
             switch (name) {
               case 'get:y':
                 return map['y'];
               case 'set:y':
                 map['y'] = args[0];
                 return;
             }
             break;
         }
-        throw new NoSuchMethodException(element, name, args);
+        throw new NoSuchMethodError(element, name, args);
       }
       dynamicUnknownElementDispatcher = dispatch;
 
       expect(foo.x, equals(42));
       expect(() { foo.x = 7; }, throwsException);
       expect(foo.id, equals('foo'));
       expect(() => bar.x, throwsException);
       bar.y = 11;
       expect(bar.y, equals(11));
       expect(foo.baz('hello'), equals('foo - hello'));
     });
 }