Remove generated directories with 100s of files.

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

Index: client/dom/generated/src/frog/HTMLButtonElement.dart
diff --git a/client/dom/generated/src/frog/HTMLButtonElement.dart b/client/dom/generated/src/frog/HTMLButtonElement.dart
deleted file mode 100644
index 6fa91d09e4cc7ab15ff66d17b2e7150992ed180f..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/frog/HTMLButtonElement.dart
+++ /dev/null
@@ -1,37 +0,0 @@
-
-class _HTMLButtonElementJs extends _HTMLElementJs implements HTMLButtonElement native "*HTMLButtonElement" {
-
-  bool autofocus;
-
-  bool disabled;
-
-  final _HTMLFormElementJs form;
-
-  String formAction;
-
-  String formEnctype;
-
-  String formMethod;
-
-  bool formNoValidate;
-
-  String formTarget;
-
-  final _NodeListJs labels;
-
-  String name;
-
-  final String type;
-
-  final String validationMessage;
-
-  final _ValidityStateJs validity;
-
-  String value;
-
-  final bool willValidate;
-
-  bool checkValidity() native;
-
-  void setCustomValidity(String error) native;
-}