In Bug 168767 I removed access to the "/Library/Audio/Plug-Ins/Components" path (see <https://trac.webkit.org/changeset/212904/trunk/Source/WebKit2/WebProcess/com.apple.WebProcess.sb.in>). This prevents AES3 support on some platforms from working properly. This sandbox update reverts this part of the change.
<rdar://problem/30927476>
Committed r213591: <http://trac.webkit.org/changeset/213591>