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

pkg/oauth2/test/utils.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;
 
 import 'dart:async';
 import 'dart:collection' show Queue;
 
-import '../../../pkg/unittest/lib/unittest.dart';
-import '../../../pkg/http/lib/http.dart' as http;
-import '../../../pkg/http/lib/testing.dart';
-import '../lib/oauth2.dart' as oauth2;
+import 'package:http/http.dart' as http;
+import 'package:http/testing.dart';
+import 'package:oauth2/oauth2.dart' as oauth2;
+import 'package:unittest/unittest.dart';
 
 class ExpectClient extends MockClient {
   final Queue<MockClientHandler> _handlers;
 
   ExpectClient._(MockClientHandler fn)
     : _handlers = new Queue<MockClientHandler>(),
       super(fn);
 
   factory ExpectClient() {
     var client;
@@ skipping 39 matching lines @@
 
 /// A matcher for functions that throw ExpirationException.
 const Matcher throwsExpirationException =
     const Throws(isExpirationException);
 
 class _ExpirationException extends TypeMatcher {
   const _ExpirationException() : super("ExpirationException");
   bool matches(item, MatchState matchState) =>
     item is oauth2.ExpirationException;
 }