[whatwg/fetch] Fetch Timing Info's end time is set to a relative timestamp, when it should be the original captured unsafe current time (Issue #1812)

Lubrsi created an issue (whatwg/fetch#1812)

### What is the issue with the Fetch Standard?

In [fetch response handover](https://fetch.spec.whatwg.org/#fetch-finale), step 3.3.2 sets the timing info's end time to a relative timestamp of a previously captured unsafe shared current time. However, this is incorrect because Resource Timing performs the relative timestamp conversion for us.

In [responseEnd](https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-responseend):
> The responseEnd getter steps are to [convert fetch timestamp](https://w3c.github.io/resource-timing/#dfn-convert-fetch-timestamp) for [this](https://webidl.spec.whatwg.org/#this)'s [timing info](https://w3c.github.io/resource-timing/#dfn-timing-info)'s [end time](https://fetch.spec.whatwg.org/#fetch-timing-info-end-time) and the [relevant global object](https://html.spec.whatwg.org/multipage/webappapis.html#concept-relevant-global) for [this](https://webidl.spec.whatwg.org/#this). See [fetch](https://fetch.spec.whatwg.org/#concept-fetch) for more info.

In [setup the resource timing entry](https://w3c.github.io/resource-timing/#dfn-setup-the-resource-timing-entry):
> [Initialize](https://www.w3.org/TR/performance-timeline/#dfn-initialize-a-performanceentry) entry given the result of [converting](https://w3c.github.io/resource-timing/#dfn-convert-fetch-timestamp) timingInfo's [start time](https://fetch.spec.whatwg.org/#fetch-timing-info-start-time) given global, "resource", requestedURL, and the result of [converting](https://w3c.github.io/resource-timing/#dfn-convert-fetch-timestamp) timingInfo's [end time](https://fetch.spec.whatwg.org/#fetch-timing-info-end-time) given global.

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