Use "package:" imports for pub.

test/global/binstubs/unknown_explicit_executable_test.dart

 // Copyright (c) 2014, 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.
 
+import 'package:pub/src/exit_codes.dart' as exit_codes;
 import 'package:scheduled_test/scheduled_stream.dart';
 
-import '../../../lib/src/exit_codes.dart' as exit_codes;
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration("errors on an unknown explicit executable", () {
     d.dir("foo", [
       d.pubspec({
         "name": "foo",
         "executables": {
           "one": "one"
         }
       }),
       d.dir("bin", [
         d.file("one.dart", "main() => print('ok');")
       ])
     ]).create();
 
     var pub = startPub(args: [
       "global", "activate", "--source", "path", "../foo",
       "-x", "who", "-x", "one", "--executable", "wat"
     ]);
 
     pub.stdout.expect(consumeThrough("Installed executable one."));
     pub.stderr.expect("Unknown executables wat and who.");
     pub.shouldExit(exit_codes.DATA);
   });
 }