Move pub into sdk/lib/_internal.

sdk/lib/_internal/pub/test/lock_file_test.dart

Index: sdk/lib/_internal/pub/test/lock_file_test.dart
diff --git a/utils/tests/pub/lock_file_test.dart b/sdk/lib/_internal/pub/test/lock_file_test.dart
similarity index 95%
rename from utils/tests/pub/lock_file_test.dart
rename to sdk/lib/_internal/pub/test/lock_file_test.dart
index 715cff6822b8ddf16dab3f3930b4e215baadfc75..2f9fb715a5f0ea168f969f0538f3d3e4fe47742a 100644
--- a/utils/tests/pub/lock_file_test.dart
+++ b/sdk/lib/_internal/pub/test/lock_file_test.dart
@@ -7,12 +7,12 @@ library lock_file_test;
 import 'package:unittest/unittest.dart';
 import 'package:yaml/yaml.dart';
 
-import '../../pub/lock_file.dart';
-import '../../pub/package.dart';
-import '../../pub/source.dart';
-import '../../pub/source_registry.dart';
-import '../../pub/utils.dart';
-import '../../pub/version.dart';
+import 'package:pub/src/lock_file.dart';
+import 'package:pub/src/package.dart';
+import 'package:pub/src/source.dart';
+import 'package:pub/src/source_registry.dart';
+import 'package:pub/src/utils.dart';
+import 'package:pub/src/version.dart';
 
 class MockSource extends Source {
   final String name = 'mock';