Merge commit 'cbafa094449f9e6646409b6bd26ba11956b32047' * commit 'cbafa094449f9e6646409b6bd26ba11956b32047': Make removeOnAccountsUpdateListener cope with null handlers.
Merge commit 'cbafa094449f9e6646409b6bd26ba11956b32047' * commit 'cbafa094449f9e6646409b6bd26ba11956b32047': Make removeOnAccountsUpdateListener cope with null handlers.