Removed fixed dependencies

packages/csslib/lib/src/tree_printer.dart

Index: packages/csslib/lib/src/tree_printer.dart
diff --git a/packages/csslib/lib/src/tree_printer.dart b/packages/csslib/lib/src/tree_printer.dart
index ba35dec47ac62b7c7a2645dbdf7a8865e786f5c8..4f196c03a40d59be88ac2a88f53b7765ddc17de7 100644
--- a/packages/csslib/lib/src/tree_printer.dart
+++ b/packages/csslib/lib/src/tree_printer.dart
@@ -85,7 +85,7 @@ class _TreePrinter extends Visitor {
     heading('MediaDirective', node);
     output.depth++;
     output.writeNodeList('media queries', node.mediaQueries);
-    output.writeNodeList('rule sets', node.rulesets);
+    output.writeNodeList('rule sets', node.rules);
     super.visitMediaDirective(node);
     output.depth--;
   }
@@ -191,7 +191,7 @@ class _TreePrinter extends Visitor {
     heading('StyletDirective', node);
     output.writeValue('dartClassName', node.dartClassName);
     output.depth++;
-    output.writeNodeList('rulesets', node.rulesets);
+    output.writeNodeList('rulesets', node.rules);
     output.depth--;
   }