Reviewed by Alexey Proskuryakov.

        Some XMLHttpRequest re-organization to aid further enhancements coming soon.

        * bindings/js/JSXMLHttpRequestCustom.cpp:
        (WebCore::JSXMLHttpRequest::send): Explicitly call overloaded versions of send,
        instead of always calling though send(DOMString).
        * dom/Document.idl: Adds native converter.

        * xml/XMLHttpRequest.cpp:
        (WebCore::XMLHttpRequest::open):
        (WebCore::XMLHttpRequest::initSend):
        (WebCore::XMLHttpRequest::send):
        (WebCore::XMLHttpRequest::createRequest):
        (WebCore::XMLHttpRequest::sameOriginRequest):
        (WebCore::XMLHttpRequest::crossSiteAccessRequest):
        (WebCore::XMLHttpRequest::abort):
        (WebCore::XMLHttpRequest::clearResponse):
        (WebCore::XMLHttpRequest::clearRequest):
        (WebCore::XMLHttpRequest::genericError):
        (WebCore::XMLHttpRequest::dispatchProgressEvent):
        * xml/XMLHttpRequest.h:
        (WebCore::XMLHttpRequest::setOnReadyStateChangeListener): Inline.
        (WebCore::XMLHttpRequest::onReadyStateChangeListener): Ditto.
        (WebCore::XMLHttpRequest::setOnLoadListener): Ditto.
        (WebCore::XMLHttpRequest::onLoadListener): Ditto.
        (WebCore::XMLHttpRequest::setOnProgressListener): Ditto.
        (WebCore::XMLHttpRequest::onProgressListener): Ditto.
        Makes the request entity body a member variable so that the send method
        can be more easily broken up.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@34741 268f45cc-cd09-0410-ab3c-d52691b4dbfc