Fix access after deletion of request

Accessing a BUrlRequest from an asynchronous handler is not safe, as the
request may have changed state already. So we cannot get the URL from
the request. For http requests, get it from the result instead.

Author: pulkomandy

Source/WebCore/platform/network/haiku/BUrlProtocolHandler.cpp

@@ -493,6 +493,7 @@ void BUrlProtocolHandler::HeadersReceived(BUrlRequest* caller,
     if (httpRequest) {
         const BHttpResult& hresult = static_cast<const BHttpResult&>(
             result);
+        url = URL(hresult.Url());
         BString location = hresult.Headers()["Location"];
         if (location.Length() > 0) {
             m_redirected = true;