Disable the Speech Synthesis feature when in Lockdown Mode.
<rdar://103316392>
Pull request: https://github.com/Webkit/WebKit/pull/7648
Committed 257933@main (f744bdf45ea9): <https://commits.webkit.org/257933@main> Reviewed commits have been landed. Closing PR #7648 and removing active labels.
*** Bug 249269 has been marked as a duplicate of this bug. ***