Remove generated directories with 100s of files.

client/html/generated/html/frog/MediaController.dart

Index: client/html/generated/html/frog/MediaController.dart
diff --git a/client/html/generated/html/frog/MediaController.dart b/client/html/generated/html/frog/MediaController.dart
deleted file mode 100644
index c34d81b8ae11adac85e4547b19cd23a231075bf0..0000000000000000000000000000000000000000
--- a/client/html/generated/html/frog/MediaController.dart
+++ /dev/null
@@ -1,33 +0,0 @@
-
-class _MediaControllerImpl implements MediaController native "*MediaController" {
-
-  final _TimeRangesImpl buffered;
-
-  num currentTime;
-
-  num defaultPlaybackRate;
-
-  final num duration;
-
-  bool muted;
-
-  final bool paused;
-
-  num playbackRate;
-
-  final _TimeRangesImpl played;
-
-  final _TimeRangesImpl seekable;
-
-  num volume;
-
-  void addEventListener(String type, EventListener listener, [bool useCapture = null]) native;
-
-  bool dispatchEvent(_EventImpl evt) native;
-
-  void pause() native;
-
-  void play() native;
-
-  void removeEventListener(String type, EventListener listener, [bool useCapture = null]) native;
-}