- some changes to prepare for converting more code to C++

        * bridge/mac/WebCoreFrameBridge.h: Added import of <Cocoa/Cocoa.h> so this header is
        self-sufficient.

        * bridge/mac/WebCoreViewFactory.h: Added forward declaration of the NSMenu class.
        Needed since the class is used in this header (for some work I have not landed yet).

        * loader/mac/LoaderNSURLExtras.h:
        * loader/mac/WebFormDataStream.h:
        Added extern "C" so this code can be used from C++.

        * loader/mac/LoaderNSURLExtras.m:
        * loader/mac/WebDataProtocol.mm:
        * loader/mac/WebDocumentLoader.mm:
        * loader/mac/WebFormDataStream.m:
        * loader/mac/WebLoader.mm:
        * loader/mac/WebMainResourceLoader.mm:
        * loader/mac/WebNetscapePlugInStreamLoader.mm:
        * loader/mac/WebPolicyDecider.mm:
        * loader/mac/WebSubresourceLoader.mm:
        Added missing includes of config.h.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@16999 268f45cc-cd09-0410-ab3c-d52691b4dbfc