/**
  * * Retrieve the HTTP authentication username and password for a given host & realm pair.
  *
  * @param host The host for which the credentials apply.
  * @param realm The realm for which the credentials apply.
  * @return String[] if found, String[0] is username, which can be null and String[1] is password.
  *     Return null if it can't find anything.
  */
 public String[] getHttpAuthUsernamePassword(String host, String realm) {
   return mDatabase.getHttpAuthUsernamePassword(host, realm);
 }
 /**
  * * Set the HTTP authentication credentials for a given host and realm.
  *
  * @param host The host for the credentials.
  * @param realm The realm for the credentials.
  * @param username The username for the password. If it is null, it means password can't be saved.
  * @param password The password
  */
 public void setHttpAuthUsernamePassword(
     String host, String realm, String username, String password) {
   mDatabase.setHttpAuthUsernamePassword(host, realm, username, password);
 }