Remove generated directories with 100s of files.

client/html/generated/html/interface/TableSectionElement.dart

Index: client/html/generated/html/interface/TableSectionElement.dart
diff --git a/client/html/generated/html/interface/TableSectionElement.dart b/client/html/generated/html/interface/TableSectionElement.dart
deleted file mode 100644
index 1fce3512b5d65fe1cd8757e24480c18bca753609..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/TableSectionElement.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 TableSectionElement extends Element {
-
-  String align;
-
-  String ch;
-
-  String chOff;
-
-  final HTMLCollection rows;
-
-  String vAlign;
-
-  void deleteRow(int index);
-
-  Element insertRow(int index);
-}