Fixes bug 92438 "http 0.9 rendered as content-type: text/plain with Java applets"

patch=cahagn_o@epita.fr, r=bbaetz, sr=darin

netwerk/streamconv/converters/nsUnknownDecoder.cpp

@@ -298,6 +298,9 @@ void nsUnknownDecoder::DetermineContentType(nsIRequest* request)
               offset = str.Find("<BODY", PR_TRUE);
               if (offset < 0) {
                 offset = str.Find("<A HREF", PR_TRUE);
+                if (offset < 0) {
+                  offset = str.Find("<APPLET", PR_TRUE);
+                }
               }
             }
           }