TBR: Use perform_vc_dump()

Change-Id: Ic13fdaca0bdf6af1df7d002bf8a148662dcaefdc
diff --git a/capsule/crawlui.py b/capsule/crawlui.py
index 8e025f6..6ad1f25 100644
--- a/capsule/crawlui.py
+++ b/capsule/crawlui.py
@@ -361,7 +361,7 @@
 
         if activity is EXITED_APP:
           return False
-        vc_dump = vc.dump(window='-1')
+        vc_dump = perform_vc_dump(vc)
         curr_view = obtain_curr_view(activity, package_name, vc_dump, view_map,
                                      still_exploring, device)
         prev_view = view_map.get(path[p_idx - 1][0])