Don't force-update components that only wants to be installed at launch

[goodov]

Most components don't need to be force-updated at each launch, but we do this, because it's the only way to force-install a component if it's absent.

The Chromium-way is to register a component at browser launch and then wait for it to be installed or updated after 1 minute.

We want to support forced updates for AdBlock components at the very start, this is already implemented via OnDemandUpdate method, but for other components we only want to force-install them if they are absent. To do this we can implement OnDemandInstall method that will only force-install the component, but not update it at launch.