Remove generated directories with 100s of files.

client/html/generated/html/interface/CSSValue.dart

Index: client/html/generated/html/interface/CSSValue.dart
diff --git a/client/html/generated/html/interface/CSSValue.dart b/client/html/generated/html/interface/CSSValue.dart
deleted file mode 100644
index 1ab3d730b73b14945d750e3c35cf3f9a951bbcb6..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/CSSValue.dart
+++ /dev/null
@@ -1,20 +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 CSSValue {
-
-  static final int CSS_CUSTOM = 3;
-
-  static final int CSS_INHERIT = 0;
-
-  static final int CSS_PRIMITIVE_VALUE = 1;
-
-  static final int CSS_VALUE_LIST = 2;
-
-  String cssText;
-
-  final int cssValueType;
-}