Closed #4597: set doLayout function of ccui to private function
Merge branch 'develop-3.0' of https://github.com/cocos2d/cocos2d-html5 into Iss_SyncEventManager
Merge pull request #1726 from dingpinglv/Iss_SyncEventManager

Closed #4597: set doLayout function of ccui to private function