[WebGPU] [Style] Inline members of Texture::m_descriptor
<rdar://problem/104786027>
Pull request: https://github.com/WebKit/WebKit/pull/9287
Committed 259565@main (81eb82843a2a): <https://commits.webkit.org/259565@main> Reviewed commits have been landed. Closing PR #9287 and removing active labels.