In Bug 179747 I removed access to the MediaAccessibility mach port, as well as read/write access to various preferences associated with that process, as it was no longer needed by modern WebKit media routines. Detailed testing reveals that read access is still needed to these preferences to properly handle custom caption styles. This patch re-enables access to the media accessibility preferences.
<rdar://problem/40339278>
Created attachment 341217 [details] Patch
Comment on attachment 341217 [details] Patch Clearing flags on attachment: 341217 Committed r232162: <https://trac.webkit.org/changeset/232162>
All reviewed patches have been landed. Closing bug.