message: Add a comment why we do not use "orElseThrow".
diff: @@ -62,6 +62,8 @@ public final class SecretKeyAccess {
  @CanIgnoreReturnValue
  public static SecretKeyAccess requireAccess(Optional<SecretKeyAccess> in)
  throws GeneralSecurityException {
  + // Using in.orElseThrow currently fails to compile on some android versions with
  + // error: unreported exception Throwable; must be caught or declared to be thrown
  if (!in.isPresent()) {
  throw new GeneralSecurityException("SecretKeyAccess is required");
  }
  