Remove generated directories with 100s of files.

client/html/generated/html/frog/DOMImplementation.dart

Index: client/html/generated/html/frog/DOMImplementation.dart
diff --git a/client/html/generated/html/frog/DOMImplementation.dart b/client/html/generated/html/frog/DOMImplementation.dart
deleted file mode 100644
index 10db4cbae7355164a4cfcf98af22a64e537a11ab..0000000000000000000000000000000000000000
--- a/client/html/generated/html/frog/DOMImplementation.dart
+++ /dev/null
@@ -1,17 +0,0 @@
-
-class _DOMImplementationImpl implements DOMImplementation native "*DOMImplementation" {
-
-  _CSSStyleSheetImpl createCSSStyleSheet(String title, String media) native;
-
-  _DocumentImpl createDocument(String namespaceURI, String qualifiedName, _DocumentTypeImpl doctype) => _FixHtmlDocumentReference(_createDocument(namespaceURI, qualifiedName, doctype));
-
-  _EventTargetImpl _createDocument(String namespaceURI, String qualifiedName, _DocumentTypeImpl doctype) native "return this.createDocument(namespaceURI, qualifiedName, doctype);";
-
-  _DocumentTypeImpl createDocumentType(String qualifiedName, String publicId, String systemId) native;
-
-  _DocumentImpl createHTMLDocument(String title) => _FixHtmlDocumentReference(_createHTMLDocument(title));
-
-  _EventTargetImpl _createHTMLDocument(String title) native "return this.createHTMLDocument(title);";
-
-  bool hasFeature(String feature, String version) native;
-}