and fixes bug 166927 "add nsICachingChannel should provide an attribute to 'load only if modified'" r=dougt sr=bzbarsky git-svn-id: svn://10.0.0.236/trunk@131261 18797224-902f-48f8-a5cc-f745e15eee43
and fixes bug 166927 "add nsICachingChannel should provide an attribute to 'load only if modified'" r=dougt sr=bzbarsky git-svn-id: svn://10.0.0.236/trunk@131261 18797224-902f-48f8-a5cc-f745e15eee43