Better anonymous session handling for storage sample.
Better anonymous session handling for storage sample.

Change-Id: Id3e8debbb7371c2fb31507654f5dcb48e0e0d4c1

theGove/atlas,jmarantz/soccersub,firebase/quickstart-js,robforee/YA,robforee/YA,DES157/quickstart-js,uhntiss/quickstart-js,yochannah/trafficuk,DaryaBeda/firebase_,theGove/atlas,DES157/quickstart-js,jmarantz/soccersub,robforee/YA,jmarantz/soccersub,yochannah/trafficuk,uhntiss/quickstart-js,uhntiss/quickstart-js,firebase/quickstart-js,DaryaBeda/firebase_,firebase/quickstart-js