As in bug 242715, apply the same cleanup to RenderSVGContainer / RenderSVGTransformableContainer, before introducing a proper RenderSVGViewportContainer implementation.
Pull request: https://github.com/WebKit/WebKit/pull/2383
Committed 252466@main (0113dff599ec): <https://commits.webkit.org/252466@main> Reviewed commits have been landed. Closing PR #2383 and removing active labels.
<rdar://problem/97025217>