Fix some observatory analysis issues.

runtime/observatory/lib/src/elements/instance_ref.dart

Index: runtime/observatory/lib/src/elements/instance_ref.dart
diff --git a/runtime/observatory/lib/src/elements/instance_ref.dart b/runtime/observatory/lib/src/elements/instance_ref.dart
index 7bbf3aebbb0c0d6094fd499f2398ce43fcef7b9b..e1a112ce439b992344bdfd3e2b5375f4c4ebb5b4 100644
--- a/runtime/observatory/lib/src/elements/instance_ref.dart
+++ b/runtime/observatory/lib/src/elements/instance_ref.dart
@@ -98,8 +98,7 @@ class InstanceRefElement extends HtmlElement implements Renderable {
     final button = new ButtonElement()..text = 'show next ${count}';
     button.onClick.listen((_) async {
       button.disabled = true;
-      _loadedInstance =
-          await _objects.get(_isolate, _instance.id, count: count * 2);
+      _loadedInstance = await _objects.get(_isolate, _instance.id);
       _r.dirty();
     });
     return [button];