Reviewed and landed by Darin Adler.

    Reviewed and landed by Darin Adler.

        - Fix <http://bugzilla.opendarwin.org/show_bug.cgi?id=3274>
        document() not supported

        Test cases added:
        * layout-tests/fast/xsl/document-function-expected.txt: Added.
        * layout-tests/fast/xsl/document-function.xml: Added.
        * layout-tests/fast/xsl/document-function.xsl: Added.
        * layout-tests/fast/xsl/resources/document-function-source.xml: Added.

        * khtml/xsl/xslt_processorimpl.cpp:
        (DOM::parseErrorFunc):
        Stub to prevent errors from getting written to the console.

        (DOM::stylesheetLoadFunc):
        Fetch and parse documents.

        (DOM::XSLTProcessorImpl::transformDocument):
        Use the processor as the global variable instead of the
        style sheet.

        * khtml/xsl/xslt_processorimpl.h:
        (DOM::XSLTProcessorImpl::stylesheet):
        (DOM::XSLTProcessorImpl::sourceDocument):
        Add accessors for source document and stylesheet.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@9546 268f45cc-cd09-0410-ab3c-d52691b4dbfc