Remove generated directories with 100s of files.

client/dom/generated/src/interface/AudioParam.dart

-// Copyright (c) 2012, 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.
-
-interface AudioParam {
-
-  final num defaultValue;
-
-  final num maxValue;
-
-  final num minValue;
-
-  final String name;
-
-  final int units;
-
-  num value;
-
-  void cancelScheduledValues(num startTime);
-
-  void exponentialRampToValueAtTime(num value, num time);
-
-  void linearRampToValueAtTime(num value, num time);
-
-  void setTargetValueAtTime(num targetValue, num time, num timeConstant);
-
-  void setValueAtTime(num value, num time);
-
-  void setValueCurveAtTime(Float32Array values, num time, num duration);
-}