Reviewed by Eric.

    Reviewed by Eric.

	- fixed <rdar://problem/3798746> hang in JavaScript getting at URL from frame; isc.fraunhofer.de (works in IE and Firefox)

	* khtml/xml/dom_docimpl.h:
        (DOM::DocumentImpl::URL): if the URL is empty, return "about:blank", the JS DOM
	at least counts on this, so we may as well do it for other languages too.
        (DOM::DocumentImpl::baseURL): base it on URL(), not m_url

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@10748 268f45cc-cd09-0410-ab3c-d52691b4dbfc