Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_HTMLSpanElementWrappingImplementation.dart

Index: client/dom/generated/src/wrapping/_HTMLSpanElementWrappingImplementation.dart
diff --git a/client/dom/generated/src/wrapping/_HTMLSpanElementWrappingImplementation.dart b/client/dom/generated/src/wrapping/_HTMLSpanElementWrappingImplementation.dart
deleted file mode 100644
index 96bcc13b11f5f8036a4ba79276d54c63bc757e61..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/wrapping/_HTMLSpanElementWrappingImplementation.dart
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright (c) 2011, 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.
-
-// WARNING: Do not edit - generated code.
-
-class _HTMLSpanElementWrappingImplementation extends _HTMLElementWrappingImplementation implements HTMLSpanElement {
-  _HTMLSpanElementWrappingImplementation() : super() {}
-
-  static create__HTMLSpanElementWrappingImplementation() native {
-    return new _HTMLSpanElementWrappingImplementation();
-  }
-
-  String get typeName() { return "HTMLSpanElement"; }
-}