Use "package:" imports for pub.

test/get/git/dependency_name_match_pubspec_test.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 pub_tests;
 
+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('requires the dependency name to match the remote pubspec '
       'name', () {
     ensureGit();
 
     d.git('foo.git', [
       d.libDir('foo'),
       d.libPubspec('foo', '1.0.0')
     ]).create();
 
     d.dir(appPath, [
       d.appPubspec({
         "weirdname": {"git": "../foo.git"}
       })
     ]).create();
 
     pubGet(error: contains('"name" field doesn\'t match expected name '
         '"weirdname".'), exitCode: exit_codes.DATA);
   });
 }