Remove generated directories with 100s of files.

client/html/generated/html/interface/CSSKeyframesRule.dart

Index: client/html/generated/html/interface/CSSKeyframesRule.dart
diff --git a/client/html/generated/html/interface/CSSKeyframesRule.dart b/client/html/generated/html/interface/CSSKeyframesRule.dart
deleted file mode 100644
index fa7cd6f50988dd0a245c9dd706552026809e0a04..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/CSSKeyframesRule.dart
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright (c) 2012, 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 CSSKeyframesRule extends CSSRule {
-
-  final CSSRuleList cssRules;
-
-  String name;
-
-  void deleteRule(String key);
-
-  CSSKeyframeRule findRule(String key);
-
-  void insertRule(String rule);
-}