Remove generated directories with 100s of files.

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

Index: client/dom/generated/src/wrapping/_HTMLPreElementWrappingImplementation.dart
diff --git a/client/dom/generated/src/wrapping/_HTMLPreElementWrappingImplementation.dart b/client/dom/generated/src/wrapping/_HTMLPreElementWrappingImplementation.dart
deleted file mode 100644
index aff4459ac9335e200cd9e9cf0de19cf8001d956a..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/wrapping/_HTMLPreElementWrappingImplementation.dart
+++ /dev/null
@@ -1,27 +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 _HTMLPreElementWrappingImplementation extends _HTMLElementWrappingImplementation implements HTMLPreElement {
-  _HTMLPreElementWrappingImplementation() : super() {}
-
-  static create__HTMLPreElementWrappingImplementation() native {
-    return new _HTMLPreElementWrappingImplementation();
-  }
-
-  int get width() { return _get_width(this); }
-  static int _get_width(var _this) native;
-
-  void set width(int value) { _set_width(this, value); }
-  static void _set_width(var _this, int value) native;
-
-  bool get wrap() { return _get_wrap(this); }
-  static bool _get_wrap(var _this) native;
-
-  void set wrap(bool value) { _set_wrap(this, value); }
-  static void _set_wrap(var _this, bool value) native;
-
-  String get typeName() { return "HTMLPreElement"; }
-}