Remove generated directories with 100s of files.

client/dom/generated/src/wrapping/_FileReaderSyncWrappingImplementation.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 _FileReaderSyncWrappingImplementation extends DOMWrapperBase implements FileReaderSync {
-  _FileReaderSyncWrappingImplementation() : super() {}
-
-  static create__FileReaderSyncWrappingImplementation() native {
-    return new _FileReaderSyncWrappingImplementation();
-  }
-
-  ArrayBuffer readAsArrayBuffer(Blob blob) {
-    return _readAsArrayBuffer(this, blob);
-  }
-  static ArrayBuffer _readAsArrayBuffer(receiver, blob) native;
-
-  String readAsBinaryString(Blob blob) {
-    return _readAsBinaryString(this, blob);
-  }
-  static String _readAsBinaryString(receiver, blob) native;
-
-  String readAsDataURL(Blob blob) {
-    return _readAsDataURL(this, blob);
-  }
-  static String _readAsDataURL(receiver, blob) native;
-
-  String readAsText(Blob blob, [String encoding = null]) {
-    if (encoding === null) {
-      return _readAsText(this, blob);
-    } else {
-      return _readAsText_2(this, blob, encoding);
-    }
-  }
-  static String _readAsText(receiver, blob) native;
-  static String _readAsText_2(receiver, blob, encoding) native;
-
-  String get typeName() { return "FileReaderSync"; }
-}