Remove generated directories with 100s of files.

client/html/generated/html/frog/FileError.dart

Index: client/html/generated/html/frog/FileError.dart
diff --git a/client/html/generated/html/frog/FileError.dart b/client/html/generated/html/frog/FileError.dart
deleted file mode 100644
index fe8a840062dcf01e7f8097959f6c0f15fa8a902d..0000000000000000000000000000000000000000
--- a/client/html/generated/html/frog/FileError.dart
+++ /dev/null
@@ -1,29 +0,0 @@
-
-class _FileErrorImpl implements FileError native "*FileError" {
-
-  static final int ABORT_ERR = 3;
-
-  static final int ENCODING_ERR = 5;
-
-  static final int INVALID_MODIFICATION_ERR = 9;
-
-  static final int INVALID_STATE_ERR = 7;
-
-  static final int NOT_FOUND_ERR = 1;
-
-  static final int NOT_READABLE_ERR = 4;
-
-  static final int NO_MODIFICATION_ALLOWED_ERR = 6;
-
-  static final int PATH_EXISTS_ERR = 12;
-
-  static final int QUOTA_EXCEEDED_ERR = 10;
-
-  static final int SECURITY_ERR = 2;
-
-  static final int SYNTAX_ERR = 8;
-
-  static final int TYPE_MISMATCH_ERR = 11;
-
-  final int code;
-}