Remove "pub list" command.

utils/pub/command_list.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.
-
-#library('command_list');
-
-#import('package.dart');
-#import('pub.dart');
-
-/**
- * Handles the `list` pub command. This is mostly just used so we can pull
- * some basic data out of pub in the integration tests. Once pub is more
- * full-featured and has other commands that test everything it does, this
- * may go away.
- */
-class ListCommand extends PubCommand {
-  String get description => 'print the contents of repositories';
-  String get usage => 'pub list';
-
-  Future onRun() {
-    // TODO(nweiz): also list the contents of the packages directory when it's
-    // able to determine the source of its packages (that is, when we have a
-    // lockfile).
-    return cache.listAll().transform((ids) {
-      _printIds('system cache', ids);
-    });
-  }
-
-  _printIds(String title, List<PackageId> ids) {
-    ids = new List<PackageId>.from(ids);
-    ids.sort((a, b) => a.compareTo(b));
-
-    print('From $title:');
-    for (var id in ids) {
-      print('  $id');
-    }
-  }
-}