Backout patches for bug 1029104 for bustage on a CLOSED TREE.

--HG--
rename : dom/xslt/xpath/XPathExpression.cpp => dom/xslt/xpath/nsXPathExpression.cpp
rename : dom/xslt/xpath/XPathExpression.h => dom/xslt/xpath/nsXPathExpression.h
extra : rebase_source : 4cd96320fa102351284cca55b66d3a54592e5212