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

utils/tests/pub/oauth2_test.dart

Index: utils/tests/pub/oauth2_test.dart
diff --git a/utils/tests/pub/oauth2_test.dart b/utils/tests/pub/oauth2_test.dart
index 0b2772b95acae80bc99c64dcc0de98c9c4b38629..dd35a9e0d35b69d976431184b2bb478cccd0bbbc 100644
--- a/utils/tests/pub/oauth2_test.dart
+++ b/utils/tests/pub/oauth2_test.dart
@@ -8,10 +8,10 @@ import 'dart:io';
 import 'dart:json' as json;
 import 'dart:uri';
 
-import '../../../pkg/http/lib/http.dart' as http;
-import '../../../pkg/scheduled_test/lib/scheduled_process.dart';
-import '../../../pkg/scheduled_test/lib/scheduled_test.dart';
-import '../../../pkg/scheduled_test/lib/scheduled_server.dart';
+import 'package:http/http.dart' as http;
+import 'package:scheduled_test/scheduled_process.dart';
+import 'package:scheduled_test/scheduled_test.dart';
+import 'package:scheduled_test/scheduled_server.dart';
 
 import '../../pub/io.dart';
 import '../../pub/utils.dart';