Remove generated directories with 100s of files.

client/html/generated/html/dartium/OptionElement.dart

Index: client/html/generated/html/dartium/OptionElement.dart
diff --git a/client/html/generated/html/dartium/OptionElement.dart b/client/html/generated/html/dartium/OptionElement.dart
deleted file mode 100644
index e4e1e900ca0e9d2d985b7602541de1a3a0e86c01..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/OptionElement.dart
+++ /dev/null
@@ -1,28 +0,0 @@
-
-class _OptionElementImpl extends _ElementImpl implements OptionElement {
-  _OptionElementImpl._wrap(ptr) : super._wrap(ptr);
-
-  bool get defaultSelected() => _wrap(_ptr.defaultSelected);
-
-  void set defaultSelected(bool value) { _ptr.defaultSelected = _unwrap(value); }
-
-  bool get disabled() => _wrap(_ptr.disabled);
-
-  void set disabled(bool value) { _ptr.disabled = _unwrap(value); }
-
-  FormElement get form() => _wrap(_ptr.form);
-
-  int get index() => _wrap(_ptr.index);
-
-  String get label() => _wrap(_ptr.label);
-
-  void set label(String value) { _ptr.label = _unwrap(value); }
-
-  bool get selected() => _wrap(_ptr.selected);
-
-  void set selected(bool value) { _ptr.selected = _unwrap(value); }
-
-  String get value() => _wrap(_ptr.value);
-
-  void set value(String value) { _ptr.value = _unwrap(value); }
-}