Use more smart pointers in GlyphData & GlyphPage.
Pull request: https://github.com/WebKit/WebKit/pull/19755
Committed 270013@main (7b5f8e5c3b54): <https://commits.webkit.org/270013@main> Reviewed commits have been landed. Closing PR #19755 and removing active labels.
<rdar://problem/117750604>