Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_EventTargetWrappingImplementation.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 _EventTargetWrappingImplementation extends DOMWrapperBase implements EventTarget {
-  _EventTargetWrappingImplementation() : super() {}
-
-  static create__EventTargetWrappingImplementation() native {
-    return new _EventTargetWrappingImplementation();
-  }
-
-  void addEventListener(String type, EventListener listener, [bool useCapture = null]) {
-    if (useCapture === null) {
-      _addEventListener(this, type, listener);
-      return;
-    } else {
-      _addEventListener_2(this, type, listener, useCapture);
-      return;
-    }
-  }
-  static void _addEventListener(receiver, type, listener) native;
-  static void _addEventListener_2(receiver, type, listener, useCapture) native;
-
-  bool dispatchEvent(Event event) {
-    return _dispatchEvent(this, event);
-  }
-  static bool _dispatchEvent(receiver, event) native;
-
-  void removeEventListener(String type, EventListener listener, [bool useCapture = null]) {
-    if (useCapture === null) {
-      _removeEventListener(this, type, listener);
-      return;
-    } else {
-      _removeEventListener_2(this, type, listener, useCapture);
-      return;
-    }
-  }
-  static void _removeEventListener(receiver, type, listener) native;
-  static void _removeEventListener_2(receiver, type, listener, useCapture) native;
-
-  String get typeName() { return "EventTarget"; }
-}