Remove generated directories with 100s of files.

client/html/generated/html/interface/BlobBuilder.dart

Index: client/html/generated/html/interface/BlobBuilder.dart
diff --git a/client/html/generated/html/interface/BlobBuilder.dart b/client/html/generated/html/interface/BlobBuilder.dart
deleted file mode 100644
index 941b685d555f5af5c095082885fcb3357ea4fc3c..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/BlobBuilder.dart
+++ /dev/null
@@ -1,14 +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 BlobBuilder default _BlobBuilderFactoryProvider {
-
-  BlobBuilder();
-
-  void append(var arrayBuffer_OR_blob_OR_value, [String endings]);
-
-  Blob getBlob([String contentType]);
-}