Resolve obvious deprecation warnings on bleeding edge

lib/src/closure/closure_annotator.dart

Index: lib/src/closure/closure_annotator.dart
diff --git a/lib/src/closure/closure_annotator.dart b/lib/src/closure/closure_annotator.dart
index d527b3df035ca75b72828c69142e1bf662403ea6..39f8031bed3cc624b8ec6e77f9c249cadb9c7c4c 100644
--- a/lib/src/closure/closure_annotator.dart
+++ b/lib/src/closure/closure_annotator.dart
@@ -2,8 +2,9 @@
 // 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 'package:analyzer/src/generated/ast.dart' hide ConstantEvaluator;
-import 'package:analyzer/src/generated/element.dart';
+import 'package:analyzer/dart/ast/ast.dart' hide ConstantEvaluator;
+import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/generated/resolver.dart' show TypeProvider;
 
 import '../js/js_ast.dart' as JS show Node, Expression, TypeRef;