Fix (more) some correctness issues for a few TestWebKitAPI tests

[rr-codes]

acd3aed

Fix (more) some correctness issues for a few TestWebKitAPI tests
https://bugs.webkit.org/show_bug.cgi?id=311909
rdar://174473169

Reviewed by Megan Gardner and Tim Horton.

Use RetainPtr instead of a raw pointer.

* Tools/TestWebKitAPI/Helpers/cocoa/TestWKWebView.mm:
(-[TestMessageHandler addMessage:withHandler:]):
(-[TestMessageHandler userContentController:didReceiveScriptMessage:]):

Canonical link: https://commits.webkit.org/310947@main

d2485e5

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	🛠 win	🛠 ios-apple
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	🧪 win-tests	⏳ 🛠 mac-apple
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe		⏳ 🛠 vision-apple
	✅ 🧪 ios-wk2-wpt	✅ 🧪 api-mac-debug	✅ 🛠 gtk3-libwebrtc
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🛠 gtk
		✅ 🧪 mac-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 api-gtk
✅ 🛠 🧪 merge	✅ 🛠 vision-sim	🧪 mac-wk2-stress	✅ 🛠 playstation
	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2
	✅ 🛠 tv
	✅ 🛠 tv-sim
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 18dbf19)

Details

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
❌ 🧪 style	❌ 🛠 ios	❌ 🛠 mac	❌ 🛠 wpe	🛠 win	⏳ 🛠 ios-apple
❌ 🧪 bindings	❌ 🛠 ios-sim	❌ 🛠 mac-AS-debug	❌ 🧪 wpe-wk2	🧪 win-tests	⏳ 🛠 mac-apple
❌ 🧪 webkitperl	❌ 🧪 ios-wk2	❌ 🧪 api-mac	❌ 🧪 api-wpe		⏳ 🛠 vision-apple
	❌ 🧪 ios-wk2-wpt	❌ 🧪 api-mac-debug	❌ 🛠 gtk3-libwebrtc
	❌ 🧪 api-ios	❌ 🧪 mac-wk1	❌ 🛠 gtk
		❌ 🧪 mac-wk2	❌ 🧪 gtk-wk2
	❌ 🛠 vision	❌ 🧪 mac-AS-debug-wk2	❌ 🧪 api-gtk
	❌ 🛠 vision-sim	❌ 🧪 mac-wk2-stress	🛠 playstation
	❌ 🧪 vision-wk2	❌ 🧪 mac-intel-wk2
	❌ 🛠 tv
	❌ 🛠 tv-sim
	🛠 watch
	❌ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash d2485e5)

Details

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	🛠 win	🛠 ios-apple
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	🧪 win-tests	⏳ 🛠 mac-apple
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe		⏳ 🛠 vision-apple
	✅ 🧪 ios-wk2-wpt	✅ 🧪 api-mac-debug	✅ 🛠 gtk3-libwebrtc
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🛠 gtk
		✅ 🧪 mac-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 api-gtk
✅ 🛠 🧪 merge	✅ 🛠 vision-sim	🧪 mac-wk2-stress	✅ 🛠 playstation
	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2
	✅ 🛠 tv
	✅ 🛠 tv-sim
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 310947@main (acd3aed): https://commits.webkit.org/310947@main

Reviewed commits have been landed. Closing PR #62424 and removing active labels.