Run load state update timer only when needed

content/browser/loader/resource_dispatcher_host_impl.h

Index: content/browser/loader/resource_dispatcher_host_impl.h
diff --git a/content/browser/loader/resource_dispatcher_host_impl.h b/content/browser/loader/resource_dispatcher_host_impl.h
index 87181a3854c6c3a4cf0af0def319239e3e8a6c22..e6e2dd1f75e94ef5c82553788d438592d1a706b7 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.h
+++ b/content/browser/loader/resource_dispatcher_host_impl.h
@@ -494,6 +494,8 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
                                int child_id,
                                bool is_sync_load);
 
+  void ScheduleUpdateLoadInfo();
+
   LoaderMap pending_loaders_;
 
   // Collection of temp files downloaded for child processes via
@@ -507,7 +509,7 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
 
   // A timer that periodically calls UpdateLoadStates while pending_requests_
   // is not empty.
-  scoped_ptr<base::RepeatingTimer<ResourceDispatcherHostImpl> >
+  scoped_ptr<base::OneShotTimer<ResourceDispatcherHostImpl> >
       update_load_states_timer_;
 
   // We own the save file manager.