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

utils/pub/hosted_source.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 hosted_source;
 
 import 'dart:async';
 import 'dart:io' as io;
 import 'dart:json' as json;
 import 'dart:uri';
 
-// TODO(nweiz): Make this import better.
-import '../../pkg/http/lib/http.dart' as http;
-import '../../pkg/pathos/lib/path.dart' as path;
+import 'package:http/http.dart' as http;
+import 'package:pathos/path.dart' as path;
 
 import 'http.dart';
 import 'io.dart';
 import 'log.dart' as log;
 import 'package.dart';
 import 'pubspec.dart';
 import 'source.dart';
 import 'source_registry.dart';
 import 'utils.dart';
 import 'version.dart';
@@ skipping 180 matching lines @@
   }
 
   var name = description["name"];
   if (name is! String) {
     throw new FormatException("The 'name' key must have a string value.");
   }
 
   var url = description.containsKey("url") ? description["url"] : _defaultUrl;
   return new Pair<String, String>(name, url);
 }