message: Reduce the visibility of PrivateKeymanagerImpl to package visible, as announced in a comment.
diff: @@ -32,10 +32,9 @@ import java.security.GeneralSecurityException;
  *
  * <p>Choosing {@code PrimitiveT} equal to {@link java.lang.Void} is valid; in this case the
  * functions {@link #getPrimitive} will throw if invoked.
  - * TODO(tholenst) Reduce visibility to package visible once all managers have been migrated.
  */
  @Alpha
  -public class PrivateKeyManagerImpl<
  +class PrivateKeyManagerImpl<
  PrimitiveT, KeyProtoT extends MessageLite, PublicKeyProtoT extends MessageLite>
  extends KeyManagerImpl<PrimitiveT, KeyProtoT> implements PrivateKeyManager<PrimitiveT> {
  