Update JDK/JAXP from Xerces:

From:
http://svn.apache.org/viewvc/xerces/java/trunk/src/org/apache/xerces/dom/DeferredDocumentImpl.java?view=log

Include Revisions:
            498500 511134 603450 965320

Fixed bugs:
           XERCESJ-977 Major Null pointer exception during DOM parsing
           XERCESJ-1223 Minor Deferred DOM: TypeInfo incorrect when an element's type is a union.
           XERCESJ-1461 Minor Some averaging computations in binary search and divide and conquer methods overflow for large values.

Revisions already in JAXP sources:
            Verified that revisions prior to and including 496162 are in JAXP sources already

Bug fixes already in JAXP sources:
            XERCESJ-1180 Major Document root changes indirectly during DeferredDocumentImpl children modification
            XERCESJ-1125 Minor Small enhancements and tweaks for the org.apache.xerces.dom package
            XERCESJ-1045 Trivial [PATCH] remove some superfluous code


Related classes:
impl/dtd/BalancedDTDGrammar.java

Older revisions are in JAXP, only need the following:
            Revision 965320


parsers/AbstractDOMParser.java

Apply the following revision only
            498500