Fixes how to lookup sdk dir to support tests deeper inside test/ folders.

pkg/smoke/test/codegen/testing_resolver_utils.dart

Index: pkg/smoke/test/codegen/testing_resolver_utils.dart
diff --git a/pkg/smoke/test/codegen/testing_resolver_utils.dart b/pkg/smoke/test/codegen/testing_resolver_utils.dart
index 42a4805af74a4cefb2e0a916d40c5b5c7a7a9f85..7a76614f5dc030967df81548152f76d7e5f1434f 100644
--- a/pkg/smoke/test/codegen/testing_resolver_utils.dart
+++ b/pkg/smoke/test/codegen/testing_resolver_utils.dart
@@ -13,8 +13,7 @@ import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_io.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/sdk_io.dart' show DirectoryBasedDartSdk;
-import 'package:code_transformers/src/dart_sdk.dart' show
-    testingDartSdkDirectory;
+import 'package:code_transformers/tests.dart' show testingDartSdkDirectory;
 
 class LibraryProvider {
   final AnalysisContext _analyzer;