Reviewed by Sam.
        
        Add plumbing for associating document loaders with application caches.
        
        * loader/DocumentLoader.cpp:
        (WebCore::DocumentLoader::DocumentLoader):
        (WebCore::DocumentLoader::~DocumentLoader):
        (WebCore::DocumentLoader::originalURL):
        (WebCore::DocumentLoader::requestURL):
        (WebCore::DocumentLoader::responseURL):
        (WebCore::DocumentLoader::responseMIMEType):
        (WebCore::DocumentLoader::setCandidateApplicationCacheGroup):
        (WebCore::DocumentLoader::setApplicationCache):
        (WebCore::DocumentLoader::toplevelApplicationCache):
        * loader/DocumentLoader.h:
        (WebCore::DocumentLoader::candidateApplicationCacheGroup):
        (WebCore::DocumentLoader::applicationCache):
        * loader/appcache/ApplicationCacheGroup.h:
        (WebCore::ApplicationCacheGroup::documentLoaderDestroyed):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@32001 268f45cc-cd09-0410-ab3c-d52691b4dbfc