Remove generated directories with 100s of files.

client/html/generated/html/frog/WheelEvent.dart

Index: client/html/generated/html/frog/WheelEvent.dart
diff --git a/client/html/generated/html/frog/WheelEvent.dart b/client/html/generated/html/frog/WheelEvent.dart
deleted file mode 100644
index e25efec2d4d5e626be7ab176452bc44a6ad458b1..0000000000000000000000000000000000000000
--- a/client/html/generated/html/frog/WheelEvent.dart
+++ /dev/null
@@ -1,37 +0,0 @@
-
-class _WheelEventImpl extends _UIEventImpl implements WheelEvent native "*WheelEvent" {
-
-  final bool altKey;
-
-  final int clientX;
-
-  final int clientY;
-
-  final bool ctrlKey;
-
-  final bool metaKey;
-
-  final int offsetX;
-
-  final int offsetY;
-
-  final int screenX;
-
-  final int screenY;
-
-  final bool shiftKey;
-
-  final bool webkitDirectionInvertedFromDevice;
-
-  final int wheelDelta;
-
-  final int wheelDeltaX;
-
-  final int wheelDeltaY;
-
-  final int x;
-
-  final int y;
-
-  void initWebKitWheelEvent(int wheelDeltaX, int wheelDeltaY, _WindowImpl view, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey) native;
-}