Remove generated directories with 100s of files.

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

-// 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 _ClientRectWrappingImplementation extends DOMWrapperBase implements ClientRect {
-  _ClientRectWrappingImplementation() : super() {}
-
-  static create__ClientRectWrappingImplementation() native {
-    return new _ClientRectWrappingImplementation();
-  }
-
-  num get bottom() { return _get_bottom(this); }
-  static num _get_bottom(var _this) native;
-
-  num get height() { return _get_height(this); }
-  static num _get_height(var _this) native;
-
-  num get left() { return _get_left(this); }
-  static num _get_left(var _this) native;
-
-  num get right() { return _get_right(this); }
-  static num _get_right(var _this) native;
-
-  num get top() { return _get_top(this); }
-  static num _get_top(var _this) native;
-
-  num get width() { return _get_width(this); }
-  static num _get_width(var _this) native;
-
-  String get typeName() { return "ClientRect"; }
-}