GRefPtr.h must be included earlier than gst/gst.h, otherwise forward declaration in the former will cause compilation error.
Pull request: https://github.com/WebKit/WebKit/pull/16212
Committed 266416@main (54d388c4d949): <https://commits.webkit.org/266416@main> Reviewed commits have been landed. Closing PR #16212 and removing active labels.
<rdar://problem/113082735>