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

pkg/scheduled_test/lib/scheduled_test.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.
 
 // TODO(nweiz): Add support for calling [schedule] while the schedule is already
 // running.
 // TODO(nweiz): Port the non-Pub-specific scheduled test libraries from Pub.
 /// A package for writing readable tests of asynchronous behavior.
 ///
 /// This package works by building up a queue of asynchronous tasks called a
@@ skipping 157 matching lines @@
 /// long as the [Schedule] knows your test is making some sort of progress, it
 /// won't time out.
 ///
 /// If a single task might take a long time, you can also manually tell the
 /// [Schedule] that it's making progress by calling [Schedule.heartbeat], which
 /// will reset the timeout whenever it's called.
 library scheduled_test;
 
 import 'dart:async';
 
-import '../../../pkg/unittest/lib/unittest.dart' as unittest;
+import 'package:unittest/unittest.dart' as unittest;
 
 import 'src/schedule.dart';
 import 'src/schedule_error.dart';
 import 'src/utils.dart';
 
-export '../../../pkg/unittest/lib/matcher.dart' hide completes, completion;
-export '../../../pkg/unittest/lib/unittest.dart' show
+export 'package:unittest/matcher.dart' hide completes, completion;
+export 'package:unittest/unittest.dart' show
     config, configure, Configuration, logMessage, expectThrow;
 
 export 'src/schedule.dart';
 export 'src/schedule_error.dart';
 export 'src/scheduled_future_matchers.dart';
 export 'src/task.dart';
 
 /// The [Schedule] for the current test. This is used to add new tasks and
 /// inspect the state of the schedule.
 ///
@@ skipping 141 matching lines @@
 /// [description] provides an optional description of the future, which is
 /// used when generating error messages.
 Future wrapFuture(Future future, [String description]) {
   if (currentSchedule == null) {
     throw new StateError("Unexpected call to wrapFuture with no current "
         "schedule.");
   }
 
   return currentSchedule.wrapFuture(future, description);
 }