Remove generated directories with 100s of files.

client/html/generated/html/interface/DOMImplementation.dart

Index: client/html/generated/html/interface/DOMImplementation.dart
diff --git a/client/html/generated/html/interface/DOMImplementation.dart b/client/html/generated/html/interface/DOMImplementation.dart
deleted file mode 100644
index e356d88b31a94971193000ecd6a71a506a123588..0000000000000000000000000000000000000000
--- a/client/html/generated/html/interface/DOMImplementation.dart
+++ /dev/null
@@ -1,18 +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 DOMImplementation {
-
-  CSSStyleSheet createCSSStyleSheet(String title, String media);
-
-  Document createDocument(String namespaceURI, String qualifiedName, DocumentType doctype);
-
-  DocumentType createDocumentType(String qualifiedName, String publicId, String systemId);
-
-  Document createHTMLDocument(String title);
-
-  bool hasFeature(String feature, String version);
-}