Software Informer client will scan the registry files, I think, and get the version from there. If you already updated to the latest version of Chrome, then simply quit the instance of the client, reboot the PC and open it again. Press the icon (refresh) to scan the PCs once again and the new version will be detected, then the client will avoid showing an update until one has been actually released.
I've just tried this and it works as explained above.