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

utils/pub/command_uploader.dart

Index: utils/pub/command_uploader.dart
diff --git a/utils/pub/command_uploader.dart b/utils/pub/command_uploader.dart
index 654165312f7aef8f6b83fd46264a22744b71737f..977415b78c4b6df10f18a33cd942fc7eaa607db4 100644
--- a/utils/pub/command_uploader.dart
+++ b/utils/pub/command_uploader.dart
@@ -8,8 +8,9 @@ import 'dart:async';
 import 'dart:io';
 import 'dart:uri';
 
-import '../../pkg/args/lib/args.dart';
-import '../../pkg/pathos/lib/path.dart' as path;
+import 'package:args/args.dart';
+import 'package:pathos/path.dart' as path;
+
 import 'entrypoint.dart';
 import 'exit_codes.dart' as exit_codes;
 import 'http.dart';