Unreviewed. Fix GObject DOM bindings API breaks test after r170700.

Add missing WebKitDOMXPathNSResolver.symbols that I forgot to add
in r170700.

* bindings/gobject/WebKitDOMXPathNSResolver.symbols: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@170885 268f45cc-cd09-0410-ab3c-d52691b4dbfc