Remove unused TextureMapperPlatformLayerDmabuf

[zdobersek]

43462ae

Remove unused TextureMapperPlatformLayerDmabuf
https://bugs.webkit.org/show_bug.cgi?id=256248

Reviewed by Adrian Perez de Castro.

The TextureMapperPlatformLayerDmabuf class isn't used and can be removed, its
functionality mostly replaced by TextureMapperPlatformLayerProxyDMABuf.

* Source/WebCore/platform/TextureMapper.cmake:
* Source/WebCore/platform/graphics/texmap/TextureMapperPlatformLayerDmabuf.cpp: Removed.
* Source/WebCore/platform/graphics/texmap/TextureMapperPlatformLayerDmabuf.h: Removed.

Canonical link: https://commits.webkit.org/263672@main

c626930

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
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	❌ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 tv-sim
✅ 🛠 🧪 merge	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash c626930)

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
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	❌ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 tv-sim
✅ 🛠 🧪 merge	✅ 🛠 watch
	✅ 🛠 watch-sim

[aperezdc]

Ahh, I love the smell of removed code in the morning afternoon 💣

[webkit-commit-queue]

Committed 263672@main (43462ae): https://commits.webkit.org/263672@main

Reviewed commits have been landed. Closing PR #13395 and removing active labels.