Get rid of all the library tags.

lib/src/backend/platform_selector/parser.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 test.backend.platform_selector.parser;
-
 import 'package:source_span/source_span.dart';
 
 import 'ast.dart';
 import 'scanner.dart';
 import 'token.dart';
 
 /// A class for parsing a platform selector.
 ///
 /// Platform selectors use a stripped-down version of the Dart expression
 /// syntax that only contains variables, parentheses, and boolean operators.
@@ skipping 81 matching lines @@
         return child;
 
       case TokenType.identifier:
         return new VariableNode(token.name, token.span);
 
       default:
         throw new SourceSpanFormatException("Expected expression.", token.span);
     }
   }
 }