Support 'Conditional' idl attribute.

client/dom/generated/src/interface/MutationRecord.dart

Index: client/dom/generated/src/interface/MutationRecord.dart
diff --git a/client/dom/generated/src/interface/MutationRecord.dart b/client/dom/generated/src/interface/MutationRecord.dart
deleted file mode 100644
index db6ff2fac2b873ae74cd912c0e5ae9b81eec1ac6..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/interface/MutationRecord.dart
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright (c) 2011, 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: Do not edit - generated code.
-
-interface MutationRecord {
-
-  NodeList get addedNodes();
-
-  String get attributeName();
-
-  String get attributeNamespace();
-
-  Node get nextSibling();
-
-  String get oldValue();
-
-  Node get previousSibling();
-
-  NodeList get removedNodes();
-
-  Node get target();
-
-  String get type();
-}