Remove generated directories with 100s of files.

client/html/generated/html/dartium/_CSSMatrixFactoryProvider.dart

Index: client/html/generated/html/dartium/_CSSMatrixFactoryProvider.dart
diff --git a/client/html/generated/html/dartium/_CSSMatrixFactoryProvider.dart b/client/html/generated/html/dartium/_CSSMatrixFactoryProvider.dart
deleted file mode 100644
index 764871db5c00611a356567cec85e2547545dcbcf..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/_CSSMatrixFactoryProvider.dart
+++ /dev/null
@@ -1,8 +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 _CSSMatrixFactoryProvider {
-  factory CSSMatrix([String cssValue = '']) =>
-      _wrap(new dom.WebKitCSSMatrix(cssValue));
-}