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

The meaningful difference with existing vectors is that they can all be explicitly cleared by the user (e.g. by clearing cookies and site data in Chrome and equivalents in other browsers). A query parameter on the `start_url` could hold a unique ID that survives such a clearing.

For instance, one way to solve this is to clear query parameters from `start_url`s when users clear site data.

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