Remove toplevel inference restriction hints, and restore as much

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

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.test.src.task.strong_mode_test;
 
 import 'dart:async';
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 13 matching lines @@
     defineReflectiveTests(VariableGathererTest);
   });
 }
 
 @reflectiveTest
 class InstanceMemberInferrerTest extends ResolverTestCase {
   InstanceMemberInferrer createInferrer(LibraryElement library) {
     AnalysisContext context = library.context;
     var inheritanceManager = new InheritanceManager(library);
     return new InstanceMemberInferrer(
-        context.typeProvider, (_) => inheritanceManager, new Set(),
+        context.typeProvider, (_) => inheritanceManager,
         typeSystem: context.typeSystem);
   }
 
   /**
    * Add a source with the given [content] and return the result of resolving
    * the source.
    */
   Future<CompilationUnitElement> resolve(String content) async {
     Source source = addNamedSource('/test.dart', content);
     if (enableNewAnalysisDriver) {
@@ skipping 444 matching lines @@
     }
   }
 }
 ''');
     var analysisResult = await computeAnalysisResult(source);
     VariableGatherer gatherer = new VariableGatherer(filter);
     analysisResult.unit.accept(gatherer);
     return gatherer.results;
   }
 }