Remove generated directories with 100s of files.

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

Index: client/dom/generated/src/wrapping/_HTMLAudioElementWrappingImplementation.dart
diff --git a/client/dom/generated/src/wrapping/_HTMLAudioElementWrappingImplementation.dart b/client/dom/generated/src/wrapping/_HTMLAudioElementWrappingImplementation.dart
deleted file mode 100644
index e02caf1e1e2e7fd781323ca3a62b8e5cce60b4c4..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/wrapping/_HTMLAudioElementWrappingImplementation.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 _HTMLAudioElementWrappingImplementation extends _HTMLMediaElementWrappingImplementation implements HTMLAudioElement {
-  _HTMLAudioElementWrappingImplementation() : super() {}
-
-  static create__HTMLAudioElementWrappingImplementation() native {
-    return new _HTMLAudioElementWrappingImplementation();
-  }
-
-  String get typeName() { return "HTMLAudioElement"; }
-}