Get rid of all the library tags.

test/span_scanner_test.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.span_scanner_test;
-
 import 'package:string_scanner/string_scanner.dart';
 import 'package:test/test.dart';
 
 void main() {
   testForImplementation("lazy", () {
     return new SpanScanner('foo\nbar\nbaz', sourceUrl: 'source');
   });
 
   testForImplementation("eager", () {
     return new SpanScanner.eager('foo\nbar\nbaz', sourceUrl: 'source');
@@ skipping 44 matching lines @@
 
       expect(span.end.offset, equals(6));
       expect(span.end.line, equals(1));
       expect(span.end.column, equals(2));
       expect(span.start.sourceUrl, equals(Uri.parse('source')));
 
       expect(span.text, equals(''));
     });
   });
 }