Reviewed by Adam.

        Properly adjust CFAbsoluteTime to time_t to fix date calculations.
        
        Compare lastModified w/ MAX_TIME_T when setting last modified date
        instead of comparing expiration against MAX_TIME_T.

        * platform/network/cf/ResourceResponseCFNet.cpp:
        (WebCore::getResourceResponse): Add kCFAbsoluteTimeIntervalSince1970 in assignment



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@17839 268f45cc-cd09-0410-ab3c-d52691b4dbfc