Bug 1049087: set temporary allowed screensharing domain of mozilla.github.io - replace for release r=gcp

modules/libpref/init/all.js

@@ -371,7 +371,12 @@ pref("media.navigator.enabled", true);
 #endif
 
 pref("media.getusermedia.screensharing.enabled", true);
+#ifdef RELEASE_BUILD
 pref("media.getusermedia.screensharing.allowed_domains", "");
+#else
+ // temporary value, not intended for release - bug 1049087
+pref("media.getusermedia.screensharing.allowed_domains", "mozilla.github.io");
+#endif
 // OS/X 10.6 and XP have screen/window sharing off by default due to various issues - Caveat emptor
 pref("media.getusermedia.screensharing.allow_on_old_platforms", false);