Remove generated directories with 100s of files.

client/html/generated/html/dartium/DOMURL.dart

Index: client/html/generated/html/dartium/DOMURL.dart
diff --git a/client/html/generated/html/dartium/DOMURL.dart b/client/html/generated/html/dartium/DOMURL.dart
deleted file mode 100644
index c487effd506e31474ead02545cf6ab4230a4ce24..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/DOMURL.dart
+++ /dev/null
@@ -1,20 +0,0 @@
-
-class _DOMURLImpl extends _DOMTypeBase implements DOMURL {
-  _DOMURLImpl._wrap(ptr) : super._wrap(ptr);
-
-  String createObjectURL(var blob_OR_stream) {
-    if (blob_OR_stream is MediaStream) {
-      return _wrap(_ptr.createObjectURL(_unwrap(blob_OR_stream)));
-    } else {
-      if (blob_OR_stream is Blob) {
-        return _wrap(_ptr.createObjectURL(_unwrap(blob_OR_stream)));
-      }
-    }
-    throw "Incorrect number or type of arguments";
-  }
-
-  void revokeObjectURL(String url) {
-    _ptr.revokeObjectURL(_unwrap(url));
-    return;
-  }
-}