Upgrade xerces to the current version.  Avoids AbstractMethodError in hosted
mode when run against JDK 1.6.  Note that this patch requires gwt-tools to be
updated to at least revision 1441.

Issue: 1280
Patch by: jat
Review by: tobyr (desk review)



git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@1444 8db76d5a-ed1c-0410-87a9-c151d255dfc7