Remove generated directories with 100s of files.

client/html/generated/html/frog/TextTrackCue.dart

Index: client/html/generated/html/frog/TextTrackCue.dart
diff --git a/client/html/generated/html/frog/TextTrackCue.dart b/client/html/generated/html/frog/TextTrackCue.dart
deleted file mode 100644
index 307795b4f1c5609a24f2d75a190a9fd657d21907..0000000000000000000000000000000000000000
--- a/client/html/generated/html/frog/TextTrackCue.dart
+++ /dev/null
@@ -1,39 +0,0 @@
-
-class _TextTrackCueImpl implements TextTrackCue native "*TextTrackCue" {
-
-  String align;
-
-  num endTime;
-
-  String id;
-
-  int line;
-
-  EventListener onenter;
-
-  EventListener onexit;
-
-  bool pauseOnExit;
-
-  int position;
-
-  int size;
-
-  bool snapToLines;
-
-  num startTime;
-
-  String text;
-
-  final _TextTrackImpl track;
-
-  String vertical;
-
-  void addEventListener(String type, EventListener listener, [bool useCapture = null]) native;
-
-  bool dispatchEvent(_EventImpl evt) native;
-
-  _DocumentFragmentImpl getCueAsHTML() native;
-
-  void removeEventListener(String type, EventListener listener, [bool useCapture = null]) native;
-}