Remove generated directories with 100s of files.

client/html/generated/html/dartium/FieldSetElement.dart

Index: client/html/generated/html/dartium/FieldSetElement.dart
diff --git a/client/html/generated/html/dartium/FieldSetElement.dart b/client/html/generated/html/dartium/FieldSetElement.dart
deleted file mode 100644
index 7d68993db71e1dd9c4345e8ffa0f244f6b18d455..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/FieldSetElement.dart
+++ /dev/null
@@ -1,21 +0,0 @@
-
-class _FieldSetElementImpl extends _ElementImpl implements FieldSetElement {
-  _FieldSetElementImpl._wrap(ptr) : super._wrap(ptr);
-
-  FormElement get form() => _wrap(_ptr.form);
-
-  String get validationMessage() => _wrap(_ptr.validationMessage);
-
-  ValidityState get validity() => _wrap(_ptr.validity);
-
-  bool get willValidate() => _wrap(_ptr.willValidate);
-
-  bool checkValidity() {
-    return _wrap(_ptr.checkValidity());
-  }
-
-  void setCustomValidity(String error) {
-    _ptr.setCustomValidity(_unwrap(error));
-    return;
-  }
-}