Bug 1389990 - back out 80491c51a8e7 (Bug 1365505 - Part2-Turn on the pref for hls not only on nightly.) r=kikuo"

MozReview-Commit-ID: 2oMz5RwsV3g

--HG--
extra : rebase_source : 1a173c078bb382502caa052c71dfbd4c5b2744b6

mobile/android/app/mobile.js

@@ -632,7 +632,9 @@ pref("media.mediadrm-widevinecdm.visible", true);
 pref("media.eme.enabled", true);
 #endif
 
+#ifdef NIGHTLY_BUILD
 pref("media.hls.enabled", true);
+#endif
 
 // Whether to suspend decoding of videos in background tabs.
 pref("media.suspend-bkgnd-video.enabled", true);