Remove generated directories with 100s of files.

client/html/generated/html/dartium/DOMImplementation.dart

Index: client/html/generated/html/dartium/DOMImplementation.dart
diff --git a/client/html/generated/html/dartium/DOMImplementation.dart b/client/html/generated/html/dartium/DOMImplementation.dart
deleted file mode 100644
index fd35a5ff71ee9da9b952e1b8b26027425fb5a148..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/DOMImplementation.dart
+++ /dev/null
@@ -1,24 +0,0 @@
-
-class _DOMImplementationImpl extends _DOMTypeBase implements DOMImplementation {
-  _DOMImplementationImpl._wrap(ptr) : super._wrap(ptr);
-
-  CSSStyleSheet createCSSStyleSheet(String title, String media) {
-    return _wrap(_ptr.createCSSStyleSheet(_unwrap(title), _unwrap(media)));
-  }
-
-  Document createDocument(String namespaceURI, String qualifiedName, DocumentType doctype) {
-    return _FixHtmlDocumentReference(_wrap(_ptr.createDocument(_unwrap(namespaceURI), _unwrap(qualifiedName), _unwrap(doctype))));
-  }
-
-  DocumentType createDocumentType(String qualifiedName, String publicId, String systemId) {
-    return _wrap(_ptr.createDocumentType(_unwrap(qualifiedName), _unwrap(publicId), _unwrap(systemId)));
-  }
-
-  Document createHTMLDocument(String title) {
-    return _FixHtmlDocumentReference(_wrap(_ptr.createHTMLDocument(_unwrap(title))));
-  }
-
-  bool hasFeature(String feature, String version) {
-    return _wrap(_ptr.hasFeature(_unwrap(feature), _unwrap(version)));
-  }
-}