Revert r30650: fails in dart2js minified mode.

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`
@@ skipping 31 matching lines @@
 class _HasProperty extends Matcher {
   final String _name;
   final Matcher _matcher;
 
   const _HasProperty(this._name, [this._matcher]);
 
   bool matches(item, Map matchState) {
     var mirror = reflect(item);
     var classMirror = mirror.type;
     var symbol = new Symbol(_name);
-    var candidate = classMirror.declarations[symbol];
-    if (candidate == null) {
+    if (!classMirror.getters.containsKey(symbol)) {
       addStateInfo(matchState, {'reason': 'has no property named "$_name"'});
       return false;
     }
-    bool isInstanceField = candidate is VariableMirror && !candidate.isStatic;
-    bool isInstanceGetter =
-        candidate is MethodMirror && candidate.isGetter && !candidate.isStatic;
-    if (!(isInstanceField || isInstanceGetter)) {
-      addStateInfo(matchState, {'reason':
-          'has a member named "$_name", but it is not an instance property'});
-      return false;
-    }
     if (_matcher == null) return true;
     var result = mirror.getField(symbol);
     var resultMatches = _matcher.matches(result.reflectee, matchState);
     if (!resultMatches) {
       addStateInfo(matchState, {'value': result.reflectee});
     }
     return resultMatches;
   }
 
   Description describe(Description description) {
@@ skipping 15 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;
   }
 }