message: Remove reference to undefined MessageHeader2.js.
diff: <script type="text/javascript" src="../../../../core/src/main/javascript/msg/ErrorHeader.js"></script>
  <script type="text/javascript" src="../../../../core/src/main/javascript/msg/MessageCapabilities.js"></script>
  <script type="text/javascript" src="../../../../core/src/main/javascript/msg/MessageHeader.js"></script>
  -<script type="text/javascript" src="../../../../core/src/main/javascript/msg/MessageHeader2.js"></script>
  <script type="text/javascript" src="../../../../core/src/main/javascript/msg/PayloadChunk.js"></script>
  <script type="text/javascript" src="../../../../core/src/main/javascript/msg/MessageBuilder.js"></script>
  <script type="text/javascript" src="../../../../core/src/main/javascript/msg/ResponseMessageBuilder.js"></script>
  