Re: [w3c/manifest] Remove the default value for start_url (#670)

@boyofgreen We discussed this change in our Google-MS chat the other day (which you couldn't attend). They said you'd want to look over it.

This is a breaking change, but the existing behaviour was probably not useful in Edge because it relied upon the document URL (which you don't have if you're just building an app from a manifest). The new behaviour lets you just ignore the document URL if you don't have one (because it's only used in the event that manifest is not same-origin as the document URL). I plan to clarify this further in a follow-up.

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