Remove generated directories with 100s of files.

client/html/generated/html/dartium/TrackElement.dart

Index: client/html/generated/html/dartium/TrackElement.dart
diff --git a/client/html/generated/html/dartium/TrackElement.dart b/client/html/generated/html/dartium/TrackElement.dart
deleted file mode 100644
index 9a740b00061c0113b4b103c11e1279693692e3d1..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/TrackElement.dart
+++ /dev/null
@@ -1,28 +0,0 @@
-
-class _TrackElementImpl extends _ElementImpl implements TrackElement {
-  _TrackElementImpl._wrap(ptr) : super._wrap(ptr);
-
-  bool get isDefault() => _wrap(_ptr.isDefault);
-
-  void set isDefault(bool value) { _ptr.isDefault = _unwrap(value); }
-
-  String get kind() => _wrap(_ptr.kind);
-
-  void set kind(String value) { _ptr.kind = _unwrap(value); }
-
-  String get label() => _wrap(_ptr.label);
-
-  void set label(String value) { _ptr.label = _unwrap(value); }
-
-  int get readyState() => _wrap(_ptr.readyState);
-
-  String get src() => _wrap(_ptr.src);
-
-  void set src(String value) { _ptr.src = _unwrap(value); }
-
-  String get srclang() => _wrap(_ptr.srclang);
-
-  void set srclang(String value) { _ptr.srclang = _unwrap(value); }
-
-  TextTrack get track() => _wrap(_ptr.track);
-}