Use "Strip URL" from the Reporting API

[yoavweiss]

We recently added an exported strip URL for use in reporting to the Reporting API. This PR makes use of that, and drops the CSP-only algorithm

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[annevk]

While this is identical, the algorithm is wrong. This would have all URLs end with #. You need to set fragment to null (or use the "exclude fragment" serialization option).

[yoavweiss]

While this is identical, the algorithm is wrong. This would have all URLs end with #. You need to set fragment to null (or use the "exclude fragment" serialization option).

Thanks! I'll fix up the reporting algo

[yoavweiss]

@annevk Filed w3c/reporting#285 (can't add you as a reviewer for some reason..)

[evilpie]

Please hold off on merging this. I am going to report some significant differences between the specifications and the implementations shortly.

[evilpie]

#735