update to sync with cache API; distinguish between caller- and cache-managed chunks when evicting cache data due to a file disappearing versus due to a file being reversioned
update to sync with cache API; distinguish between caller- and
cache-managed chunks when evicting cache data due to a file disappearing
versus due to a file being reversioned

syndicate-storage/syndicate-core,syndicate-storage/syndicate-core,iychoi/syndicate-core,iychoi/syndicate-core,syndicate-storage/syndicate-core,syndicate-storage/syndicate-core,iychoi/syndicate-core,iychoi/syndicate-core