Switch pkg packages, pub, and dartdoc to use package: imports.

pkg/oauth2/test/utils_test.dart

 // Copyright (c) 2012, 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 utils_test;
 
-import '../../../pkg/unittest/lib/unittest.dart';
-import '../lib/src/utils.dart';
-
+import 'package:oauth2/src/utils.dart';
+import 'package:unittest/unittest.dart';
 
 void main() {
   group('AuthenticateHeader', () {
     test("parses a scheme", () {
       var header = new AuthenticateHeader.parse('bearer');
       expect(header.scheme, equals('bearer'));
       expect(header.parameters, equals({}));
     });
 
     test("lower-cases the scheme", () {
@@ skipping 62 matching lines @@
       expect(() => new AuthenticateHeader.parse('bearer foo="bar",'),
           throwsFormatException);
     });
 
     test("won't parse a multiple params without a comma", () {
       expect(() => new AuthenticateHeader.parse('bearer foo="bar" bar="baz"'),
           throwsFormatException);
     });
   });
 }