Re: [w3c/manifest] Privacy Review: handle start_url tracking (#399)

@alancutter 
> > clearing local storage should clear that URL, and provide means for re-triggering installation of apps
> 
> I'm not sure how re-installation would work if we clear all site provided URLs. Where would we get the start_url from?

Yeah, I don't think it's easy, but better to figure that out now. Presumably send the user back to the bare origin (maybe even with a well-known parameter regarding re-install), if we think the bare origin is unlikely to include user-specific state.

In the analogy to app stores, for example, a user can uninstall and then re-install an app and not assume it's already customized to them because an app in an app store is typically limited so that it's the same URL and same code for all users. Or at least, that's our typical assumption, because of the costs of going through app store review and the incentives for having many users of a single app. If Progressive Web Apps accrue reputation and reviews as well, then there would be a disincentive for app owners to make every one on its own domain (or even own URL) because it won't be able to aggregate reviews and installation counts.

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