Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/dart2js/minifies_in_release_mode_test.dart

Index: sdk/lib/_internal/pub/test/dart2js/minifies_in_release_mode_test.dart
diff --git a/sdk/lib/_internal/pub/test/dart2js/minifies_in_release_mode_test.dart b/sdk/lib/_internal/pub/test/dart2js/minifies_in_release_mode_test.dart
deleted file mode 100644
index b4694064d2c09812aba52d0cbc8d34cca9dca96f..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/test/dart2js/minifies_in_release_mode_test.dart
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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.
-
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-import '../serve/utils.dart';
-
-main() {
-  initConfig();
-  integration("generates minified JS in release mode", () {
-    d.dir(appPath, [
-      d.appPubspec(),
-      d.dir("web", [
-        d.file("main.dart", "void main() => print('hello');")
-      ])
-    ]).create();
-
-    pubServe(args: ["--mode", "release"]);
-    requestShouldSucceed("main.dart.js", isMinifiedDart2JSOutput);
-    endPubServe();
-  });
-}