Get rid of all the library tags.

lib/src/string_scanner.dart

 // Copyright (c) 2014, 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 string_scanner.string_scanner;
-
 import 'package:source_span/source_span.dart';
 
 import 'exception.dart';
 import 'utils.dart';
 
 /// When compiled to JS, forward slashes are always escaped in [RegExp.pattern].
 ///
 /// See issue 17998.
 final _slashAutoEscape = new RegExp("/").pattern == "\\/";
 
@@ skipping 150 matching lines @@
     throw new StringScannerException(message, span, string);
   }
 
   // TODO(nweiz): Make this handle long lines more gracefully.
   /// Throws a [FormatException] describing that [name] is expected at the
   /// current position in the string.
   void _fail(String name) {
     error("expected $name.", position: this.position, length: 0);
   }
 }