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

utils/pub/io.dart

 // Copyright (c) 2013, 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.
 
 /// Helper functionality to make working with IO easier.
 library io;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:isolate';
 import 'dart:json';
 import 'dart:uri';
 
-import '../../pkg/pathos/lib/path.dart' as path;
-import '../../pkg/http/lib/http.dart' show ByteStream;
+import 'package:pathos/path.dart' as path;
+import 'package:http/http.dart' show ByteStream;
 import 'error_group.dart';
 import 'exit_codes.dart' as exit_codes;
 import 'log.dart' as log;
 import 'utils.dart';
 
-export '../../pkg/http/lib/http.dart' show ByteStream;
+export 'package:http/http.dart' show ByteStream;
 
 /// Returns whether or not [entry] is nested somewhere within [dir]. This just
 /// performs a path comparison; it doesn't look at the actual filesystem.
 bool isBeneath(String entry, String dir) {
   var relative = path.relative(entry, from: dir);
   return !path.isAbsolute(relative) && path.split(relative)[0] != '..';
 }
 
 /// Determines if a file or directory exists at [path].
 bool entryExists(String path) => dirExists(path) || fileExists(path);
@@ skipping 733 matching lines @@
   const PubProcessResult(this.stdout, this.stderr, this.exitCode);
 
   bool get success => exitCode == 0;
 }
 
 /// Gets a [Uri] for [uri], which can either already be one, or be a [String].
 Uri _getUri(uri) {
   if (uri is Uri) return uri;
   return Uri.parse(uri);
 }