fix build due to mdv -> template_binding rename

pkg/observe/lib/src/dirty_check.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.
 
 /**
  * *Warning*: this library is **internal**, and APIs are subject to change.
  *
  * Tracks observable objects for dirty checking and testing purposes.
  *
  * It can collect all observed objects, which can be used to trigger predictable
  * delivery of all pending changes in a test, including objects allocated
- * internally to another library, such as those in `package:mdv`.
+ * internally to another library, such as those in `package:template_binding`.
  */
 library observe.src.dirty_check;
 
 import 'dart:async';
 import 'package:logging/logging.dart';
 import 'package:observe/observe.dart' show Observable;
 
 /** The number of active observables in the system. */
 int get allObservablesCount => _allObservablesCount;
 
@@ skipping 110 matching lines @@
       registerUnaryCallback: wrapUnaryCallback);
 }
 
 /**
  * Forks a [Zone] off the current one that does dirty-checking automatically
  * after each batch of async operations. Equivalent to:
  *
  *     Zone.current.fork(specification: dirtyCheckZoneSpec());
  */
 Zone dirtyCheckZone() => Zone.current.fork(specification: dirtyCheckZoneSpec());