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

utils/pub/http.dart

Index: utils/pub/http.dart
diff --git a/utils/pub/http.dart b/utils/pub/http.dart
index 59fb586df26a0e6b023c5d9cb7ebd76c91a887f0..dadc4b12959399b5f915a70e2db97d9ad34f5154 100644
--- a/utils/pub/http.dart
+++ b/utils/pub/http.dart
@@ -9,8 +9,8 @@ import 'dart:async';
 import 'dart:io';
 import 'dart:json' as json;
 
-// TODO(nweiz): Make this import better.
-import '../../pkg/http/lib/http.dart' as http;
+import 'package:http/http.dart' as http;
+
 import 'io.dart';
 import 'log.dart' as log;
 import 'oauth2.dart' as oauth2;