Reviewed by Alp Toker.

        https://bugs.webkit.org/show_bug.cgi?id=22041
        Fix CURL crashes on the test suite

        Fix segfault with setDefersLoading(). Do not call into curl when we
        don't have a CURL handle.

        It is attempted to defer the loading before the load has been
        started (no curl handle was allocated yet). If that happens then
        just remember that. ResourceHandleManager::startJob is already taking
        care of this and in initResourceHandle the the downloading will
        be paused if needed.

        Fixes fast/loader/simultaneous-reloads-assert.html

        * platform/network/curl/ResourceHandleCurl.cpp:
        (WebCore::ResourceHandle::setDefersLoading):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@38071 268f45cc-cd09-0410-ab3c-d52691b4dbfc