Execute self-closing SVG script element

This is based on the WebKit patch here:
https://github.com/WebKit/WebKit/pull/23309

Fixed: 331692966
Change-Id: I452c3ce2d85515f66af2c43f90349d6df855b612
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5406823


Auto-Submit: Joey Arhar <jarhar@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1280440}