Get rid of all the library tags.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1577273004 .
diff --git a/lib/shelf_proxy.dart b/lib/shelf_proxy.dart
index 3d1926a..47bfbcf 100644
--- a/lib/shelf_proxy.dart
+++ b/lib/shelf_proxy.dart
@@ -2,8 +2,6 @@
 // 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 shelf_proxy;
-
 import 'package:http/http.dart' as http;
 import 'package:path/path.dart' as p;
 import 'package:shelf/shelf.dart';
diff --git a/lib/src/utils.dart b/lib/src/utils.dart
index f30545e..8347377 100644
--- a/lib/src/utils.dart
+++ b/lib/src/utils.dart
@@ -2,8 +2,6 @@
 // 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 shelf_proxy.utils;
-
 import 'dart:async';
 
 // TODO(nweiz): remove this when issue 7786 is fixed.
diff --git a/test/shelf_proxy_test.dart b/test/shelf_proxy_test.dart
index fe76ddc..cf70cb6 100644
--- a/test/shelf_proxy_test.dart
+++ b/test/shelf_proxy_test.dart
@@ -2,8 +2,6 @@
 // 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 shelf_proxy;
-
 import 'dart:async';
 
 import 'package:http/http.dart' as http;