Remove FetchAPIEnabled preference

[annevk]

72f76d9

Remove FetchAPIEnabled preference
https://bugs.webkit.org/show_bug.cgi?id=264118
rdar://117880701

Reviewed by Brent Fulgham.

There's no need for this and all the API accessors for this preference
already no-op.

* Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml:
* Source/WebCore/Modules/fetch/FetchBody.idl:
* Source/WebCore/Modules/fetch/FetchRequest.idl:
* Source/WebCore/Modules/fetch/FetchResponse.idl:
* Source/WebCore/Modules/fetch/WindowOrWorkerGlobalScope+Fetch.idl:

Canonical link: https://commits.webkit.org/270156@main

1dca9ec

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🛠 gtk
	🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	🧪 gtk-wk2
✅ 🛠 🧪 jsc	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🧪 api-gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2	✅ 🛠 jsc-armv7
	🛠 tv-sim		✅ 🧪 jsc-armv7-tests
✅ 🛠 🧪 merge	✅ 🛠 watch		✅ 🛠 jsc-mips
	🛠 watch-sim		✅ 🧪 jsc-mips-tests

[webkit-early-warning-system]

EWS run on current version of this PR (hash 1dca9ec)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🛠 gtk
	🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	🧪 gtk-wk2
✅ 🛠 🧪 jsc	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🧪 api-gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2	✅ 🛠 jsc-armv7
	🛠 tv-sim		✅ 🧪 jsc-armv7-tests
✅ 🛠 🧪 merge	✅ 🛠 watch		✅ 🛠 jsc-mips
	🛠 watch-sim		✅ 🧪 jsc-mips-tests

[brentfulgham]

Oh good -- we should have removed it a while ago. It was considered as a Lockdown Mode toggle, but we found the hit to Web Compatibility was too great. We should have removed this back then.

r=me

[webkit-commit-queue]

Committed 270156@main (72f76d9): https://commits.webkit.org/270156@main

Reviewed commits have been landed. Closing PR #19916 and removing active labels.