Reapply CL: first step for modular support in fasta

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 5171b135e04ff31a7887d3d23362e5cffd2101ba..488ba68821981c23b48ce7fc0dac3cef2e5e6973 100644
--- a/pkg/front_end/test/subpackage_relationships_test.dart
+++ b/pkg/front_end/test/subpackage_relationships_test.dart
@@ -40,9 +40,12 @@ final subpackageRules = {
     'lib/src/fasta/source',
     'lib/src/incremental',
   ]),
-  'lib/src/base': new SubpackageRules(
-      mayImportAnalyzer: true,
-      allowedDependencies: ['lib', "lib/src/fasta", 'lib/src/incremental']),
+  'lib/src/base': new SubpackageRules(allowedDependencies: [
+    'lib',
+    'lib/src',
+    'lib/src/fasta',
+    'lib/src/incremental'
+  ]),
   'lib/src/codegen': new SubpackageRules(),
   'lib/src/fasta': new SubpackageRules(allowedDependencies: [
     'lib',