remove some dead code

lib/storage/file.js

@@ -671,29 +671,6 @@ var unarchiveChannel = function (env, channelName, cb) {
         }));
     });
 };
-/*
-var flushUnusedChannels = function (env, cb, frame) {
-    var currentTime = +new Date();
-
-    var expiration = typeof(frame) === 'undefined'?  env.channelExpirationMs: frame;
-    Object.keys(env.channels).forEach(function (chanId) {
-        var chan = env.channels[chanId];
-        if (typeof(chan.atime) !== 'number') { return; }
-        if (currentTime >= expiration + chan.atime) {
-            closeChannel(env, chanId, function (err) {
-                if (err) {
-                    console.error(err);
-                    return;
-                }
-                if (env.verbose) {
-                    console.log("Closed channel [%s]", chanId);
-                }
-            });
-        }
-    });
-    cb();
-};
-*/
 
 /*  channelBytes
     calls back with an error or the size (in bytes) of a channel and its metadata
@@ -1235,11 +1212,6 @@ module.exports.create = function (conf, _cb) {
                     closeChannel(env, channelName, Util.both(cb, next));
                 });
             },
-            // iterate over open channels and close any that are not active
-            flushUnusedChannels: function (cb) {
-                cb("DEPRECATED");
-                //flushUnusedChannels(env, cb);
-            },
             // write to a log file
             log: function (channelName, content, cb) {
 // you probably want the events in your log to be in the correct order.
@@ -1253,8 +1225,4 @@ module.exports.create = function (conf, _cb) {
             }
         });
     });
-    /*
-    it = setInterval(function () {
-        flushUnusedChannels(env, function () { });
-    }, 5000);*/
 };