correct syntax error.

tools/dom/src/native_DOMImplementation.dart

Index: tools/dom/src/native_DOMImplementation.dart
diff --git a/tools/dom/src/native_DOMImplementation.dart b/tools/dom/src/native_DOMImplementation.dart
index 01a8ecba0119389a27e72b181c99671213f48470..01b7a1bb9c2b0b0cdac45f7e3b884074fc980909 100644
--- a/tools/dom/src/native_DOMImplementation.dart
+++ b/tools/dom/src/native_DOMImplementation.dart
@@ -206,13 +206,13 @@ final _forwardingPrintClosure = _Utils.forwardingPrint;
     if (repeating) {
       int id = window._setInterval(() {
         callback(this);
-      }, milliSeconds);)
+      }, milliSeconds);
       _canceler = () => window._clearInterval(id);
     } else {
       int id = window._setTimeout(() {
         _canceler = null;
         callback(this);
-      }, milliSeconds);)
+      }, milliSeconds);
       _canceler = () => window._clearTimeout(id);
     }
   }