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 152cbbd77e46f8c6918970b5a9029d405b6cddf1..51d5b7386acf7007e6b01a26dc54553e4a92d0ec 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.h
+++ b/content/browser/loader/resource_dispatcher_host_impl.h
@@ -502,8 +502,8 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
       RegisteredTempFiles;  // key is child process id
   RegisteredTempFiles registered_temp_files_;
 
-  // A timer that periodically calls UpdateLoadStates while pending_requests_
-  // is not empty.
+  // A timer that periodically calls UpdateLoadInfo while pending_loaders_ is
+  // not empty and at least one RenderViewHost is loading.
   scoped_ptr<base::RepeatingTimer<ResourceDispatcherHostImpl> >
       update_load_states_timer_;