Use "package:" imports for pub.

test/global/binstubs/explicit_and_no_executables_options_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_test.dart';
 
-import '../../../lib/src/exit_codes.dart' as exit_codes;
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration("errors if -x and --no-executables are both passed", () {
     d.dir("foo", [
       d.libPubspec("foo", "1.0.0")
     ]).create();
 
     schedulePub(args: [
       "global", "activate", "--source", "path", "../foo",
       "-x", "anything", "--no-executables"
     ], error: contains("Cannot pass both --no-executables and --executable."),
         exitCode: exit_codes.USAGE);
   });
 }