Removed fixed dependencies

packages/csslib/lib/src/analyzer.dart

Index: packages/csslib/lib/src/analyzer.dart
diff --git a/packages/csslib/lib/src/analyzer.dart b/packages/csslib/lib/src/analyzer.dart
index 7c7372cf2d2e6371e71688a06fd00d5fc431e260..6c6ba6d6143a284c5fb11bf377db2c9eb7d5073f 100644
--- a/packages/csslib/lib/src/analyzer.dart
+++ b/packages/csslib/lib/src/analyzer.dart
@@ -415,9 +415,9 @@ class _MediaRulesReplacer extends Visitor {
   _MediaRulesReplacer(this._ruleSet, this._newRules);
 
   visitMediaDirective(MediaDirective node) {
-    var index = node.rulesets.indexOf(_ruleSet);
+    var index = node.rules.indexOf(_ruleSet);
     if (index != -1) {
-      node.rulesets.insertAll(index + 1, _newRules);
+      node.rules.insertAll(index + 1, _newRules);
       _foundAndReplaced = true;
     }
   }