Remove generated directories with 100s of files.

client/html/generated/html/dartium/MediaQueryList.dart

Index: client/html/generated/html/dartium/MediaQueryList.dart
diff --git a/client/html/generated/html/dartium/MediaQueryList.dart b/client/html/generated/html/dartium/MediaQueryList.dart
deleted file mode 100644
index 64d0f8baf0a7ec0d24bc7c86479666d4e60dbff7..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/MediaQueryList.dart
+++ /dev/null
@@ -1,18 +0,0 @@
-
-class _MediaQueryListImpl extends _DOMTypeBase implements MediaQueryList {
-  _MediaQueryListImpl._wrap(ptr) : super._wrap(ptr);
-
-  bool get matches() => _wrap(_ptr.matches);
-
-  String get media() => _wrap(_ptr.media);
-
-  void addListener(MediaQueryListListener listener) {
-    _ptr.addListener(_unwrap(listener));
-    return;
-  }
-
-  void removeListener(MediaQueryListListener listener) {
-    _ptr.removeListener(_unwrap(listener));
-    return;
-  }
-}