fix BrowserStore bug in actionOnItemsWithPrefix and refactor BrowserStore

web/react/stores/socket_store.jsx

@@ -10,8 +10,6 @@ var client = require('../utils/client.jsx');
 var Constants = require('../utils/constants.jsx');
 var ActionTypes = Constants.ActionTypes;
 
-var BrowserStore = require('../stores/browser_store.jsx');
-
 var CHANGE_EVENT = 'change';
 
 var conn;