     @root = new window.Firebase 'https://shining-fire-6810.firebaseio.com/'
 
   ###*
-    @param {app.user.Store} userStore
-  ###
-  simpleLogin: (userStore) ->
-    goog.asserts.assert !@authClient, 'Can be called only once'
-    @authClient = new window.FirebaseSimpleLogin @root, @onSimpleLogin.bind @, userStore
-
-  ###*
     NOTE(steida): This method is called whenever user login status has changed.
     TODO(steida): Refactor.
-    @param {app.user.Store} userStore
     @param {Object} error
     @param {Object} user
   ###
-  onSimpleLogin: (userStore, error, user) ->
+  onSimpleLogin: (error, user) ->
     if error
       # TODO(steida): Report to server.
       console.log error

class app.Firebase

  ###*
    @constructor
  ###
  constructor: ->
    @setFireBaseRefs()

  ###*
    @type {Firebase}

      scope: 'email'

  logout: ->
    @authClient.logout()
    console.log 'logout'