The changes made in Bug 204770 mean that we no longer need access to 'com.apple.iohideventsystem'. We should now remove it from the WebContent process sandbox.
<rdar://problem/57572913>
Correction. This is: <rdar://problem/36085204>
Created attachment 387369 [details] Patch
Committed r254365: <https://trac.webkit.org/changeset/254365>