Added support for experimental CFNetwork-based loader (not turned on yet).
        
        While I was there, I did the following platform cleanup:
        - Windows now uses USE(WININET) instead of PLATFORM(WIN_OS), to match the
          USE(CFNETWORK) idiom.
        - Removed some #includes of windows.h in platform-independent headers.
        - Changed #ifdef __APPLE__ to PLATFORM(MAC)
        - Fixed some build bustage, including case-sensitive filesystem bustage.

        * loader/loader.cpp:
        (WebCore::Loader::receivedAllData):
        * platform/Cursor.h:
        * platform/KURL.h:
        * platform/ResourceLoader.h:
        * platform/ResourceLoaderClient.h:
        * platform/ResourceLoaderInternal.h:
        (WebCore::ResourceLoaderInternal::ResourceLoaderInternal):
        * platform/cfnet/KURLCFNet.cpp: Added.
        (WebCore::KURL::createCFURL):
        * platform/cfnet/ResourceLoaderCFNet.cpp: Added.
        (WebCore::willSendRequest):
        (WebCore::didReceiveChallenge):
        (WebCore::didCancelChallenge):
        (WebCore::didReceiveResponse):
        (WebCore::didReceiveData):
        (WebCore::didFinishLoading):
        (WebCore::didFail):
        (WebCore::willCacheResponse):
        (WebCore::addHeadersFromString):
        (WebCore::ResourceLoaderInternal::~ResourceLoaderInternal):
        (WebCore::ResourceLoader::~ResourceLoader):
        (WebCore::arrayFromFormData):
        (WebCore::emptyPerform):
        (WebCore::runLoaderThread):
        (WebCore::ResourceLoader::start):
        (WebCore::ResourceLoader::cancel):
        * platform/win/CursorWin.cpp:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@16089 268f45cc-cd09-0410-ab3c-d52691b4dbfc