Remove generated directories with 100s of files.

client/dom/generated/src/frog/_WebKitCSSMatrixFactoryProvider.dart

Index: client/dom/generated/src/frog/_WebKitCSSMatrixFactoryProvider.dart
diff --git a/client/dom/generated/src/frog/_WebKitCSSMatrixFactoryProvider.dart b/client/dom/generated/src/frog/_WebKitCSSMatrixFactoryProvider.dart
deleted file mode 100644
index 3aa05b57f577da47512de16610ff028efa2d1cb3..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/frog/_WebKitCSSMatrixFactoryProvider.dart
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-class _WebKitCSSMatrixFactoryProvider {
-  factory WebKitCSSMatrix([String cssValue = null]) native
-'''
-if (cssValue == null) return new WebKitCSSMatrix();
-return new WebKitCSSMatrix(cssValue);
-''';
-}