[whatwg/fetch] 5.6 garbage collection makes GC observable via service worker & resource timing (#810)

[5.6. Garbage collection](https://fetch.spec.whatwg.org/#garbage-collection) says "Observable through script" means observable through fetch()’s arguments and return value. Other ways, such as communicating with the server through a side-channel are not included."

However, this would reveal GC timing via service worker and resource timing. The resource timing is particularly problematic because it would make it easier to depend on GC timing.

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