Remove toplevel inference restriction hints, and restore as much

pkg/analyzer/test/src/task/strong_mode_test.dart

Index: pkg/analyzer/test/src/task/strong_mode_test.dart
diff --git a/pkg/analyzer/test/src/task/strong_mode_test.dart b/pkg/analyzer/test/src/task/strong_mode_test.dart
index f8981aea27ebc0dad64b4fb3d9041e29616dad53..4c964f4e48001bb0be1327a8b5627b597ff40554 100644
--- a/pkg/analyzer/test/src/task/strong_mode_test.dart
+++ b/pkg/analyzer/test/src/task/strong_mode_test.dart
@@ -31,7 +31,7 @@ class InstanceMemberInferrerTest extends ResolverTestCase {
     AnalysisContext context = library.context;
     var inheritanceManager = new InheritanceManager(library);
     return new InstanceMemberInferrer(
-        context.typeProvider, (_) => inheritanceManager, new Set(),
+        context.typeProvider, (_) => inheritanceManager,
         typeSystem: context.typeSystem);
   }