Remove generated directories with 100s of files.

client/html/generated/html/dartium/DataTransferItemList.dart

Index: client/html/generated/html/dartium/DataTransferItemList.dart
diff --git a/client/html/generated/html/dartium/DataTransferItemList.dart b/client/html/generated/html/dartium/DataTransferItemList.dart
deleted file mode 100644
index 60afa46bab4269ec0f6e3f1643c228b28fdff72d..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/DataTransferItemList.dart
+++ /dev/null
@@ -1,30 +0,0 @@
-
-class _DataTransferItemListImpl extends _DOMTypeBase implements DataTransferItemList {
-  _DataTransferItemListImpl._wrap(ptr) : super._wrap(ptr);
-
-  int get length() => _wrap(_ptr.length);
-
-  void add(var data_OR_file, [String type = null]) {
-    if (data_OR_file is File) {
-      if (type === null) {
-        _ptr.add(_unwrap(data_OR_file));
-        return;
-      }
-    } else {
-      if (data_OR_file is String) {
-        _ptr.add(_unwrap(data_OR_file), _unwrap(type));
-        return;
-      }
-    }
-    throw "Incorrect number or type of arguments";
-  }
-
-  void clear() {
-    _ptr.clear();
-    return;
-  }
-
-  DataTransferItem item(int index) {
-    return _wrap(_ptr.item(_unwrap(index)));
-  }
-}