Get rid of all the library tags.

test/dart2js/allows_import_in_dart_code_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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.
 
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
 
 main() {
   integration("handles imports in the Dart code", () {
     d.dir("foo", [
       d.libPubspec("foo", "0.0.1"),
       d.dir("lib", [
         d.file("foo.dart", """
-library foo;
-foo() => 'footext';
 """)
       ])
     ]).create();
 
     d.dir(appPath, [
       d.appPubspec({
         "foo": {"path": "../foo"}
       }),
       d.dir("lib", [
         d.file("lib.dart", """
-library lib;
-lib() => 'libtext';
 """)
       ]),
       d.dir("web", [
         d.file("main.dart", """
 import 'package:foo/foo.dart';
 import 'package:myapp/lib.dart';
 void main() {
   print(foo());
   print(lib());
 }
 """)
       ])
     ]).create();
 
     pubGet();
     pubServe();
     requestShouldSucceed("main.dart.js", contains("footext"));
     requestShouldSucceed("main.dart.js", contains("libtext"));
     endPubServe();
   });
 }