Remove generated directories with 100s of files.

client/html/generated/html/dartium/Clipboard.dart

Index: client/html/generated/html/dartium/Clipboard.dart
diff --git a/client/html/generated/html/dartium/Clipboard.dart b/client/html/generated/html/dartium/Clipboard.dart
deleted file mode 100644
index 3a5d6c8e00cc301600d53a26aa2f4de69677360f..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/Clipboard.dart
+++ /dev/null
@@ -1,41 +0,0 @@
-
-class _ClipboardImpl extends _DOMTypeBase implements Clipboard {
-  _ClipboardImpl._wrap(ptr) : super._wrap(ptr);
-
-  String get dropEffect() => _wrap(_ptr.dropEffect);
-
-  void set dropEffect(String value) { _ptr.dropEffect = _unwrap(value); }
-
-  String get effectAllowed() => _wrap(_ptr.effectAllowed);
-
-  void set effectAllowed(String value) { _ptr.effectAllowed = _unwrap(value); }
-
-  FileList get files() => _wrap(_ptr.files);
-
-  DataTransferItemList get items() => _wrap(_ptr.items);
-
-  List get types() => _wrap(_ptr.types);
-
-  void clearData([String type = null]) {
-    if (type === null) {
-      _ptr.clearData();
-      return;
-    } else {
-      _ptr.clearData(_unwrap(type));
-      return;
-    }
-  }
-
-  String getData(String type) {
-    return _wrap(_ptr.getData(_unwrap(type)));
-  }
-
-  bool setData(String type, String data) {
-    return _wrap(_ptr.setData(_unwrap(type), _unwrap(data)));
-  }
-
-  void setDragImage(ImageElement image, int x, int y) {
-    _ptr.setDragImage(_unwrap(image), _unwrap(x), _unwrap(y));
-    return;
-  }
-}