Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_ArrayBufferViewWrappingImplementation.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 _ArrayBufferViewWrappingImplementation extends DOMWrapperBase implements ArrayBufferView {
-  _ArrayBufferViewWrappingImplementation() : super() {}
-
-  static create__ArrayBufferViewWrappingImplementation() native {
-    return new _ArrayBufferViewWrappingImplementation();
-  }
-
-  ArrayBuffer get buffer() { return _get_buffer(this); }
-  static ArrayBuffer _get_buffer(var _this) native;
-
-  int get byteLength() { return _get_byteLength(this); }
-  static int _get_byteLength(var _this) native;
-
-  int get byteOffset() { return _get_byteOffset(this); }
-  static int _get_byteOffset(var _this) native;
-
-  String get typeName() { return "ArrayBufferView"; }
-}