Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_HTMLCanvasElementWrappingImplementation.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 _HTMLCanvasElementWrappingImplementation extends _HTMLElementWrappingImplementation implements HTMLCanvasElement {
-  _HTMLCanvasElementWrappingImplementation() : super() {}
-
-  static create__HTMLCanvasElementWrappingImplementation() native {
-    return new _HTMLCanvasElementWrappingImplementation();
-  }
-
-  int get height() { return _get_height(this); }
-  static int _get_height(var _this) native;
-
-  void set height(int value) { _set_height(this, value); }
-  static void _set_height(var _this, int value) native;
-
-  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;
-
-  Object getContext(String contextId) {
-    return _getContext(this, contextId);
-  }
-  static Object _getContext(receiver, contextId) native;
-
-  String toDataURL(String type) {
-    return _toDataURL(this, type);
-  }
-  static String _toDataURL(receiver, type) native;
-
-  String get typeName() { return "HTMLCanvasElement"; }
-}