[WebGPU] createSurface() should be a method on Instance, not Device
<rdar://problem/104542682>
Pull request: https://github.com/WebKit/WebKit/pull/8964
Committed 259455@main (03912f4a91fa): <https://commits.webkit.org/259455@main> Reviewed commits have been landed. Closing PR #8964 and removing active labels.