Fix one more place where r183751 allows default controls to become visible after playing to wireless target.
<rdar://problem/21145806>
Created attachment 254278 [details] Proposed patch.
Committed r185207: https://trac.webkit.org/r185207
This broke two tests: https://build.webkit.org/results/Apple%20Yosemite%20Release%20WK1%20(Tests)/r185212%20(5829)/results.html
Fix for the tests broken by r185207 committed in r185220: https://trac.webkit.org/r185220