Start pulling pub from its own repo.

sdk/lib/_internal/pub/lib/src/command/upgrade.dart

Index: sdk/lib/_internal/pub/lib/src/command/upgrade.dart
diff --git a/sdk/lib/_internal/pub/lib/src/command/upgrade.dart b/sdk/lib/_internal/pub/lib/src/command/upgrade.dart
deleted file mode 100644
index bd2389d8ebe1736388dd39ebbad6f8b48ee581db..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/lib/src/command/upgrade.dart
+++ /dev/null
@@ -1,41 +0,0 @@
-// 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 pub.command.upgrade;
-
-import 'dart:async';
-
-import '../command.dart';
-import '../log.dart' as log;
-import '../solver/version_solver.dart';
-
-/// Handles the `upgrade` pub command.
-class UpgradeCommand extends PubCommand {
-  String get name => "upgrade";
-  String get description =>
-      "Upgrade the current package's dependencies to latest versions.";
-  String get invocation => "pub upgrade [dependencies...]";
-  String get docUrl => "http://dartlang.org/tools/pub/cmd/pub-upgrade.html";
-  List<String> get aliases => const ["update"];
-
-  bool get isOffline => argResults['offline'];
-
-  UpgradeCommand() {
-    argParser.addFlag('offline',
-        help: 'Use cached packages instead of accessing the network.');
-
-    argParser.addFlag('dry-run', abbr: 'n', negatable: false,
-        help: "Report what dependencies would change but don't change any.");
-  }
-
-  Future run() async {
-    var dryRun = argResults['dry-run'];
-    await entrypoint.acquireDependencies(SolveType.UPGRADE,
-        useLatest: argResults.rest, dryRun: dryRun);
-    if (isOffline) {
-      log.warning("Warning: Upgrading when offline may not update you to the "
-                  "latest versions of your dependencies.");
-    }
-  }
-}