Reviewed by John.

    Reviewed by John.

        - fixed <rdar://problem/3915449> paths are relative to the old src URL after document.open, which is supposed to clear the document, including the URL

        * khtml/xml/dom_docimpl.h: Added a new openInternal function for use by KHTMLPart.
        * khtml/xml/dom_docimpl.cpp:
        (DocumentImpl::open): Changed to do everything we did before, but also clear the URL and set the
        base URL based on the enclosing document. This is the basic JavaScript/DOM operation of opening a
        document, which is supposed to clear the document, including the URL. In the long run we might want
        to do even more document "resetting and clearing" in here, but this URL clearing is what's needed
        now to fix the most important problem.
        (DocumentImpl::openInternal): Moved the old open code in here, except for the "parsing" check, which
        is unnecessary and inappropriate in the one place we call this.

        * khtml/khtml_part.cpp: (KHTMLPart::begin): Call openInternal instead of open.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8577 268f45cc-cd09-0410-ab3c-d52691b4dbfc