Remove library tags, they aren't needed

lib/src/closure/closure_annotation.dart

Index: lib/src/closure/closure_annotation.dart
diff --git a/lib/src/closure/closure_annotation.dart b/lib/src/closure/closure_annotation.dart
index 80d5aae3838b536bea61a6a2845114cef71b5562..ef502bca2c2c8636286614e271257d435a85fe2e 100644
--- a/lib/src/closure/closure_annotation.dart
+++ b/lib/src/closure/closure_annotation.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_annotation;
-
 import 'closure_type.dart';
 
 /// Set of closure annotations that can be [toString]ed to a single JsDoc comment.