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

pkg/scheduled_test/lib/descriptor.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.
 
 /// A library for declaratively describing a filesystem structure, usually for
 /// the purpose of creating or validating it as part of a scheduled test.
 ///
 /// You can use [dir] and [file] to define a filesystem structure. Then, you can
 /// call [Descriptor.create] to schedule a task that will create that structure
 /// on the physical filesystem, or [Descriptor.validate] to schedule an
@@ skipping 46 matching lines @@
 ///           return tempDir.delete(recursive: true);
 ///         });
 ///       });
 ///
 ///       // ...
 ///     }
 library descriptor;
 
 import 'dart:async';
 
-import '../../../pkg/pathos/lib/path.dart' as path;
+import 'package:pathos/path.dart' as path;
 
 import 'scheduled_test.dart';
 import 'src/descriptor/async_descriptor.dart';
 import 'src/descriptor/descriptor.dart';
 import 'src/descriptor/directory_descriptor.dart';
 import 'src/descriptor/file_descriptor.dart';
 import 'src/descriptor/nothing_descriptor.dart';
 import 'src/descriptor/pattern_descriptor.dart';
 
 export 'src/descriptor/async_descriptor.dart';
@@ skipping 43 matching lines @@
 
 /// A convenience method for creating a [PatternDescriptor] descriptor that
 /// constructs a [FileDescriptor] descriptor.
 PatternDescriptor filePattern(Pattern name, [String contents='']) =>
   pattern(name, (realName) => file(realName, contents));
 
 /// A convenience method for creating a [PatternDescriptor] descriptor that
 /// constructs a [DirectoryDescriptor] descriptor.
 PatternDescriptor dirPattern(Pattern name, [Iterable<Descriptor> contents]) =>
   pattern(name, (realName) => dir(realName, contents));