Move pub into sdk/lib/_internal.

sdk/lib/_internal/pub/test/install/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 'dart:io';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
@@ skipping 20 matching lines @@
 
     // TODO(nweiz): clean up this RegExp when either issue 4706 or 4707 is
     // fixed.
     schedulePub(args: ['install'],
         error: new RegExp(r'^The name you specified for your dependency, '
             '"weirdname", doesn\'t match the name "foo" in its '
             r'pubspec\.'),
         exitCode: 1);
   });
 }