Refactored logic in updateMediaControlUI to correctly update the controls when no receiver is available
Refactored logic in updateMediaControlUI to correctly update the controls when no receiver is available

cdcabrera/CastVideos-chrome,jch/CastVideos-chrome,jch/CastVideos-chrome,shyamalschandra/CastVideos-chrome,shyamalschandra/CastVideos-chrome,cdcabrera/CastVideos-chrome