Remove library tags, they aren't needed

lib/src/closure/closure_annotator.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 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;
 
 import 'closure_annotation.dart';
 import 'closure_type.dart';
 
 /// Mixin that can generate [ClosureAnnotation]s for Dart elements and types.
 abstract class ClosureAnnotator {
   TypeProvider get types;
@@ skipping 118 matching lines @@
     if (type is InterfaceType) {
       return _closureTypeForClass(type.element, type);
     }
     return new ClosureType.unknown();
   }
 
   /// TODO(ochafik): Use a package-and-file-uri-dependent naming, since libraries can collide.
   String _getFullName(ClassElement type) =>
       type.library.name == '' ? type.name : '${type.library.name}.${type.name}';
 }