Remove utils/archive. It is not used at this point.

utils/archive/archive.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-/**
- * The primary library file for the archive library. This is the only file that
- * should be imported by clients.
- */
-library archive;
-
-import 'entry.dart' as entry;
-import 'reader.dart' as reader;
-
-// TODO(nweiz): Remove this when 3071 is fixed.
-/** An error raised by the archive library. */
-abstract class ArchiveException {
-  /** A description of the error that occurred. */
-  final String message;
-
-  /** The error code for the error, or null. */
-  final int errno;
-}
-
-// TODO(nweiz): Remove this when 3071 is fixed.
-/** See [reader.ArchiveReader]. */
-class ArchiveReader extends reader.ArchiveReader {}
-
-// TODO(nweiz): Remove this when 3071 is fixed.
-/** See [entry.ArchiveEntry]. */
-class ArchiveEntry extends entry.ArchiveEntry {
-  ArchiveEntry.internal(List properties, int archiveId)
-    : super.internal(properties, archiveId);
-
-  /** Create a new [ArchiveEntry] with default values for all of its fields. */
-  static Future<ArchiveEntry> create() => entry.ArchiveEntry.create();
-}