Remove generated directories with 100s of files.

client/dom/generated/src/frog/HTMLSelectElement.dart

Index: client/dom/generated/src/frog/HTMLSelectElement.dart
diff --git a/client/dom/generated/src/frog/HTMLSelectElement.dart b/client/dom/generated/src/frog/HTMLSelectElement.dart
deleted file mode 100644
index 2e0a88abd5211b7e8e2c8169fd835fce52521d21..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/frog/HTMLSelectElement.dart
+++ /dev/null
@@ -1,47 +0,0 @@
-
-class _HTMLSelectElementJs extends _HTMLElementJs implements HTMLSelectElement native "*HTMLSelectElement" {
-
-  bool autofocus;
-
-  bool disabled;
-
-  final _HTMLFormElementJs form;
-
-  final _NodeListJs labels;
-
-  int length;
-
-  bool multiple;
-
-  String name;
-
-  final _HTMLOptionsCollectionJs options;
-
-  bool required;
-
-  int selectedIndex;
-
-  int size;
-
-  final String type;
-
-  final String validationMessage;
-
-  final _ValidityStateJs validity;
-
-  String value;
-
-  final bool willValidate;
-
-  void add(_HTMLElementJs element, _HTMLElementJs before) native;
-
-  bool checkValidity() native;
-
-  _NodeJs item(int index) native;
-
-  _NodeJs namedItem(String name) native;
-
-  void remove(var index_OR_option) native;
-
-  void setCustomValidity(String error) native;
-}