Renaming unittest library names to all have package prefix names.

pkg/unittest/lib/mirror_matchers.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.
 /**
  * The mirror matchers library provides some additional matchers that
  * make use of dart:mirrors.
  *
  * ## Installing ##
  *
  * Use [pub][] to install this package. Add the following to your `pubspec.yaml`
  * file.
  *
  *     dependencies:
  *       unittest: any
  *
  * Then run `pub install`.
  *
  * Import this into your Dart code with:
  *
  *     import 'package:unittest/mirror_matchers.dart';
  *
  * For more information, see the [unittest package on pub.dartlang.org].
  * (http://pub.dartlang.org/packages/unittest).
  *
  * [pub]: http://pub.dartlang.org
  * [pkg]: http://pub.dartlang.org/packages/mirror_matchers
  */
-library mirror_matchers;
+library unittest.mirror_matchers;
 
 import 'dart:mirrors';
 
 import 'matcher.dart';
 
 /**
  * Returns a matcher that checks if a class instance has a property
  * with name [name], and optionally, if that property in turn satisfies
  * a [matcher].
  */
@@ skipping 51 matching lines @@
       var innerDescription = new StringDescription();
       _matcher.describeMismatch(matchState['value'], innerDescription,
           matchState['state'], verbose);
       if (innerDescription.length > 0) {
         mismatchDescription.add(' which ').add(innerDescription.toString());
       }
     }
     return mismatchDescription;
   }
 }