Move tools to tool folder.

pkg/front_end/test/subpackage_relationships_test.dart

Index: pkg/front_end/test/subpackage_relationships_test.dart
diff --git a/pkg/front_end/test/subpackage_relationships_test.dart b/pkg/front_end/test/subpackage_relationships_test.dart
index ad94f17c141c8d53466acfe9c25ed7e8779d2a4c..d1ccb5357d70161635e818a0880cd9acec282283 100644
--- a/pkg/front_end/test/subpackage_relationships_test.dart
+++ b/pkg/front_end/test/subpackage_relationships_test.dart
@@ -66,14 +66,12 @@ final subpackageRules = {
   'lib/src/codegen': new SubpackageRules(),
   'lib/src/fasta': new SubpackageRules(allowedDependencies: [
     'lib',
-    'lib/src',
     'lib/src/base',
     'lib/src/fasta/builder',
     'lib/src/fasta/dill',
     'lib/src/fasta/kernel',
     'lib/src/fasta/parser',
     'lib/src/fasta/scanner',
-    'lib/src/fasta/testing',
     'lib/src/fasta/util',
     'lib/src/scanner',
   ]),