Replace the use of raw pointers to RenderSVGResourceContainer by WeakPtr.
Pull request: https://github.com/WebKit/WebKit/pull/9025
Committed 259498@main (28504233c351): <https://commits.webkit.org/259498@main> Reviewed commits have been landed. Closing PR #9025 and removing active labels.
<rdar://problem/104751430>