Support 'Conditional' idl attribute.

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

Index: client/dom/generated/src/interface/PointerLock.dart
diff --git a/client/dom/generated/src/interface/PointerLock.dart b/client/dom/generated/src/interface/PointerLock.dart
deleted file mode 100644
index 93a3b74e76d6b212cfe6243c8adae900fa107676..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/interface/PointerLock.dart
+++ /dev/null
@@ -1,14 +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 PointerLock {
-
-  bool get isLocked();
-
-  void lock(Element target, [VoidCallback successCallback, VoidCallback failureCallback]);
-
-  void unlock();
-}