[simple_browser] unfocus on navigation

Change-Id: I90aa756b1bf8b4f13e0ea5f73cf6a5001bea3a64
diff --git a/bin/simple_browser/lib/src/widgets/navigation_bar.dart b/bin/simple_browser/lib/src/widgets/navigation_bar.dart
index 7869dd6..add7bab 100644
--- a/bin/simple_browser/lib/src/widgets/navigation_bar.dart
+++ b/bin/simple_browser/lib/src/widgets/navigation_bar.dart
@@ -36,6 +36,11 @@
     _controller = TextEditingController();
     _urlListener = widget.bloc.url.listen((url) {
       _controller.text = url;
+      // TODO: Should remove once system wide focus management works
+      //   This is a hack, focus should be removed because the user clicked anywhere in the page,
+      //   not because a new page has loaded. But we don't know the user clicked, because the
+      //   webpage is a separate process.
+      _focusNode.unfocus();
     });
     super.initState();
   }