Remove generated directories with 100s of files.

client/html/generated/html/interface/PerformanceNavigation.dart

Index: client/html/generated/html/interface/PerformanceNavigation.dart
diff --git a/client/html/generated/html/interface/PerformanceNavigation.dart b/client/html/generated/html/interface/PerformanceNavigation.dart
deleted file mode 100644
index e8db75d46c5b99e0372f7f135b7a878b8647db14..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/PerformanceNavigation.dart
+++ /dev/null
@@ -1,20 +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 PerformanceNavigation {
-
-  static final int TYPE_BACK_FORWARD = 2;
-
-  static final int TYPE_NAVIGATE = 0;
-
-  static final int TYPE_RELOAD = 1;
-
-  static final int TYPE_RESERVED = 255;
-
-  final int redirectCount;
-
-  final int type;
-}