Remove generated directories with 100s of files.

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

Index: client/dom/generated/src/interface/MutationEvent.dart
diff --git a/client/dom/generated/src/interface/MutationEvent.dart b/client/dom/generated/src/interface/MutationEvent.dart
deleted file mode 100644
index 6371e53c9d0983410ae3636645e9438a5f23e306..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/interface/MutationEvent.dart
+++ /dev/null
@@ -1,26 +0,0 @@
-// 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 MutationEvent extends Event {
-
-  static final int ADDITION = 2;
-
-  static final int MODIFICATION = 1;
-
-  static final int REMOVAL = 3;
-
-  final int attrChange;
-
-  final String attrName;
-
-  final String newValue;
-
-  final String prevValue;
-
-  final Node relatedNode;
-
-  void initMutationEvent(String type, bool canBubble, bool cancelable, Node relatedNode, String prevValue, String newValue, String attrName, int attrChange);
-}