[GStreamer][WebRTC] Minor cleanups in IncomingSourceGStreamer

[philn]

25fd484

[GStreamer][WebRTC] Minor cleanups in IncomingSourceGStreamer
https://bugs.webkit.org/show_bug.cgi?id=247423

Reviewed by Xabier Rodriguez-Calvar.

There is no need for a queue between the valve and the tee. Utility methods for opening/closing now
un-needed were removed as well.

* Source/WebCore/platform/mediastream/gstreamer/RealtimeIncomingSourceGStreamer.cpp:
(WebCore::RealtimeIncomingSourceGStreamer::RealtimeIncomingSourceGStreamer):
(WebCore::RealtimeIncomingSourceGStreamer::startProducingData):
(WebCore::RealtimeIncomingSourceGStreamer::stopProducingData):
(WebCore::RealtimeIncomingSourceGStreamer::closeValve const): Deleted.
(WebCore::RealtimeIncomingSourceGStreamer::openValve const): Deleted.
* Source/WebCore/platform/mediastream/gstreamer/RealtimeIncomingSourceGStreamer.h:
* Source/WebCore/platform/mediastream/gstreamer/RealtimeIncomingVideoSourceGStreamer.cpp:

Canonical link: https://commits.webkit.org/256393@main

a11d375

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 🧪 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-debug	✅ 🛠 gtk	✅ 🛠 wincairo
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🛠 mac-AS-debug	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 api-mac	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk1
	✅ 🛠 tv-sim	✅ 🧪 mac-wk2
✅ 🛠 🧪 merge	✅ 🛠 watch	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch-sim	✅ 🧪 mac-wk2-stress

[webkit-early-warning-system]

EWS run on current version of this PR (hash a11d375)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 🧪 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-debug	✅ 🛠 gtk	✅ 🛠 wincairo
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🛠 mac-AS-debug	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 api-mac	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk1
	✅ 🛠 tv-sim	✅ 🧪 mac-wk2
✅ 🛠 🧪 merge	✅ 🛠 watch	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch-sim	✅ 🧪 mac-wk2-stress

[webkit-commit-queue]

Committed 256393@main (25fd484): https://commits.webkit.org/256393@main

Reviewed commits have been landed. Closing PR #6082 and removing active labels.