Reenable check_elements_invariants_test

tests/compiler/dart2js/check_elements_invariants_test.dart

 // Copyright (c) 2014, 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.
 
 import 'dart:async';
 import 'package:compiler/src/apiimpl.dart';
-import 'package:compiler/src/dart2jslib.dart' show NullSink;
 import 'package:expect/expect.dart';
-import 'package:compiler/src/filenames.dart';
-import 'package:compiler/src/source_file_provider.dart';
 import 'package:compiler/src/elements/elements.dart'
     show ClassElement;
 import 'package:compiler/src/resolution/class_members.dart'
     show ClassMemberMixin;
 import "package:async_helper/async_helper.dart";
+import 'memory_compiler.dart';
 
 
 const String DART2JS_SOURCE =
     'pkg/compiler/lib/src/dart2js.dart';
 const List<String> DART2JS_OPTIONS = const <String>[
       '--categories=Client,Server',
       '--disable-type-inference'
     ];
 
 Iterable<ClassElement> computeLiveClasses(Compiler compiler) {
   return new Set<ClassElement>()
-      ..addAll(compiler.resolverWorld.instantiatedClasses)
-      ..addAll(compiler.codegenWorld.instantiatedClasses);
+      ..addAll(compiler.resolverWorld.directlyInstantiatedClasses)
+      ..addAll(compiler.codegenWorld.directlyInstantiatedClasses);
 }
 
 void checkClassInvariants(ClassElement cls) {
   ClassMemberMixin impl = cls;
   Expect.isTrue(impl.areAllMembersComputed(),
       "Not all members have been computed for $cls.");
 }
 
 Future checkElementInvariantsAfterCompiling(Uri uri) {
-  var inputProvider = new CompilerSourceFileProvider();
-  var handler = new FormattingDiagnosticHandler(inputProvider);
-  var compiler = new Compiler(inputProvider.readStringFromUri,
-                              NullSink.outputProvider,
-                              handler,
-                              currentDirectory.resolve('sdk/'),
-                              currentDirectory.resolve('sdk/'),
-                              DART2JS_OPTIONS,
-                              {});
-
+  var compiler = compilerFor({}, options: DART2JS_OPTIONS);
    return compiler.run(uri).then((passed) {
      Expect.isTrue(passed, "Compilation of dart2js failed.");
 
      computeLiveClasses(compiler).forEach(checkClassInvariants);
    });
 }
 
 void main () {
-  var uri = currentDirectory.resolve(DART2JS_SOURCE);
+  var uri = Uri.base.resolve(DART2JS_SOURCE);
   asyncTest(() => checkElementInvariantsAfterCompiling(uri));
 }