Move pub into sdk/lib/_internal.

sdk/lib/_internal/pub/test/validator/size_test.dart

Index: sdk/lib/_internal/pub/test/validator/size_test.dart
diff --git a/utils/tests/pub/validator/size_test.dart b/sdk/lib/_internal/pub/test/validator/size_test.dart
similarity index 87%
rename from utils/tests/pub/validator/size_test.dart
rename to sdk/lib/_internal/pub/test/validator/size_test.dart
index 3dd1e2148f7b79d2a062b6982371ce5bad97bc69..888b80d3dd02a75f0dc07ce1bbab673555644d7f 100644
--- a/utils/tests/pub/validator/size_test.dart
+++ b/sdk/lib/_internal/pub/test/validator/size_test.dart
@@ -7,9 +7,9 @@ import 'dart:math' as math;
 
 import 'package:scheduled_test/scheduled_test.dart';
 
-import '../../../pub/entrypoint.dart';
-import '../../../pub/validator.dart';
-import '../../../pub/validator/size.dart';
+import 'package:pub/src/entrypoint.dart';
+import 'package:pub/src/validator.dart';
+import 'package:pub/src/validator/size.dart';
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';