Update copyright in dart:dom interface templates

client/dom/generated/src/interface/WebKitCSSMatrix.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
 // WARNING: Do not edit - generated code.
 
 interface WebKitCSSMatrix default _WebKitCSSMatrixFactoryProvider {
 
   WebKitCSSMatrix([String spec]);
 
   num a;
@@ skipping 53 matching lines @@
   void setMatrixValue(String string);
 
   WebKitCSSMatrix skewX(num angle);
 
   WebKitCSSMatrix skewY(num angle);
 
   String toString();
 
   WebKitCSSMatrix translate(num x, num y, num z);
 }