Remove library tags, they aren't needed

lib/src/closure/closure_annotation.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_annotation;
-
 import 'closure_type.dart';
 
 /// Set of closure annotations that can be [toString]ed to a single JsDoc comment.
 /// See https://developers.google.com/closure/compiler/docs/js-for-compiler
 ///
 /// TODO(ochafik): Support inclusion of 'normal' comments (including @param comments).
 class ClosureAnnotation {
   final bool isConst;
   final bool isConstructor;
   final bool isFinal;
@@ skipping 98 matching lines @@
       if (isNonWildcard(returnType)) lines.add('@return {$returnType}');
       if (isNonWildcard(throwsType)) lines.add('@throws {$throwsType}');
 
       if (lines.length == 0) return '';
       if (lines.length == 1) return '/** ${lines.single} */';
       __cachedString = '/**\n' + lines.map((l) => ' * $l').join('\n') + '\n */';
     }
     return __cachedString;
   }
 }