Remove generated directories with 100s of files.

client/html/generated/html/interface/CSSStyleSheet.dart

Index: client/html/generated/html/interface/CSSStyleSheet.dart
diff --git a/client/html/generated/html/interface/CSSStyleSheet.dart b/client/html/generated/html/interface/CSSStyleSheet.dart
deleted file mode 100644
index 119ce357d7a6e3bead0c02854aa14b2f388143c8..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/CSSStyleSheet.dart
+++ /dev/null
@@ -1,22 +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 CSSStyleSheet extends StyleSheet {
-
-  final CSSRuleList cssRules;
-
-  final CSSRule ownerRule;
-
-  final CSSRuleList rules;
-
-  int addRule(String selector, String style, [int index]);
-
-  void deleteRule(int index);
-
-  int insertRule(String rule, int index);
-
-  void removeRule(int index);
-}