Remove library tags, they aren't needed

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 104ed14c45baa340fb69a0820eea221bf6e2cee9..7229a1da9983d0bcd6ee110fca69d112d8ab61a9 100644
--- a/lib/src/closure/closure_annotator.dart
+++ b/lib/src/closure/closure_annotator.dart
@@ -2,8 +2,6 @@
 // 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 dev_compiler.src.closure.closure_codegen;
-
 import 'package:analyzer/analyzer.dart' show ParameterKind;
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/resolver.dart' show TypeProvider;