Even more smart pointers for local variables in WebCore

[annevk]

d603af5bd2e5ffb28d86aafc84d3480d63c61f5d

Even more smart pointers for local variables in WebCore
https://bugs.webkit.org/show_bug.cgi?id=294728

Reviewed by NOBODY (OOPS!).

Apply https://github.com/WebKit/WebKit/wiki/Safer-CPP-Guidelines

https://github.com/WebKit/WebKit/commit/d603af5bd2e5ffb28d86aafc84d3480d63c61f5d

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

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/d603af5bd2e5ffb28d86aafc84d3480d63c61f5d)

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

[webkit-ews-buildbot]

Safer C++ Build #40969 (https://github.com/WebKit/WebKit/commit/d603af5bd2e5ffb28d86aafc84d3480d63c61f5d)

:warning: Found 18 fixed files! Please update expectations in Source/[Project]/SaferCPPExpectations by running the following command and update your pull request:

• Tools/Scripts/update-safer-cpp-expectations -p WebCore --UncheckedLocalVarsChecker platform/Widget.cpp inspector/agents/WebConsoleAgent.cpp inspector/WebInjectedScriptManager.cpp Modules/web-locks/WebLockManager.cpp bindings/js/WebCoreJSClientData.cpp --UncountedLambdaCapturesChecker Modules/WebGPU/Implementation/WebGPUImpl.cpp --UncountedLocalVarsChecker platform/mac/WidgetMac.mm Modules/webtransport/WebTransport.cpp platform/Widget.cpp page/cocoa/WebTextIndicatorLayer.mm inspector/agents/WebConsoleAgent.cpp editing/cocoa/WebContentReaderCocoa.mm inspector/WebInjectedScriptManager.cpp inspector/WebInjectedScriptHost.cpp Modules/WebGPU/Implementation/WebGPUCompositorIntegrationImpl.cpp Modules/web-locks/WebLockManager.cpp testing/js/WebCoreTestSupport.cpp Modules/websockets/WebSocket.cpp workers/WorkerMessagingProxy.cpp Modules/WebGPU/Implementation/WebGPUImpl.cpp page/WindowOrWorkerGlobalScope.cpp Modules/indexeddb/WindowOrWorkerGlobalScopeIndexedDatabase.cpp Modules/webcodecs/WebCodecsVideoFrameAlgorithms.cpp

[webkit-early-warning-system]

EWS run on current version of this PR (hash https://github.com/WebKit/WebKit/commit/20103a31648c56dc67c9af88a64e761fe99b71aa)

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

[webkit-commit-queue]

Committed 296475@main (6b87ca2de313): https://commits.webkit.org/296475@main

Reviewed commits have been landed. Closing PR #46963 and removing active labels.