Remove generated directories with 100s of files.

client/html/generated/html/dartium/TextTrackList.dart

Index: client/html/generated/html/dartium/TextTrackList.dart
diff --git a/client/html/generated/html/dartium/TextTrackList.dart b/client/html/generated/html/dartium/TextTrackList.dart
deleted file mode 100644
index e7a248d1ca2c4cd8f094e84a0bdf11eaffdcd389..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/TextTrackList.dart
+++ /dev/null
@@ -1,38 +0,0 @@
-
-class _TextTrackListImpl extends _DOMTypeBase implements TextTrackList {
-  _TextTrackListImpl._wrap(ptr) : super._wrap(ptr);
-
-  int get length() => _wrap(_ptr.length);
-
-  EventListener get onaddtrack() => _wrap(_ptr.onaddtrack);
-
-  void set onaddtrack(EventListener value) { _ptr.onaddtrack = _unwrap(value); }
-
-  void addEventListener(String type, EventListener listener, [bool useCapture = null]) {
-    if (useCapture === null) {
-      _ptr.addEventListener(_unwrap(type), _unwrap(listener));
-      return;
-    } else {
-      _ptr.addEventListener(_unwrap(type), _unwrap(listener), _unwrap(useCapture));
-      return;
-    }
-  }
-
-  bool dispatchEvent(Event evt) {
-    return _wrap(_ptr.dispatchEvent(_unwrap(evt)));
-  }
-
-  TextTrack item(int index) {
-    return _wrap(_ptr.item(_unwrap(index)));
-  }
-
-  void removeEventListener(String type, EventListener listener, [bool useCapture = null]) {
-    if (useCapture === null) {
-      _ptr.removeEventListener(_unwrap(type), _unwrap(listener));
-      return;
-    } else {
-      _ptr.removeEventListener(_unwrap(type), _unwrap(listener), _unwrap(useCapture));
-      return;
-    }
-  }
-}