code: public boolean deletePassword(String account) {
  		int errorCode = deletePassword0(account.getBytes(UTF_8));
  		if (errorCode == OSSTATUS_SUCCESS) {
  			return true;
  		} else if (errorCode == OSSTATUS_NOT_FOUND) {
  			return false;
  		} else {
  			throw new JniException("Failed to delete password. Error code " + errorCode);
  		}
  	}
docs: Deletes the password associated with the specified key from the system keychain.
  
  @param account Unique account identifier
  @return <code>true</code> if the passwords has been deleted, <code>false</code> if no entry for the given key exists.