Removed copybara config file.
Removed copybara config file.

Change-Id: If72ec02f4c5cf9e47b150b8683d266de191219ef

FirebaseExtended/cocos2dx-cpp-sample,FirebaseExtended/cocos2dx-cpp-sample,FirebaseExtended/cocos2dx-cpp-sample,FirebaseExtended/cocos2dx-cpp-sample