misc: closure cleanup in viewer from #5231 (#5235)
misc: closure cleanup in viewer from #5231 (#5235)


umaar/lighthouse,mixed/lighthouse,wardpeet/lighthouse,wardpeet/lighthouse,GoogleChrome/lighthouse,ev1stensberg/lighthouse,umaar/lighthouse,GoogleChrome/lighthouse,deepanjanroy/lighthouse,ev1stensberg/lighthouse,GoogleChrome/lighthouse,umaar/lighthouse,ev1stensberg/lighthouse,mixed/lighthouse,GoogleChrome/lighthouse,wardpeet/lighthouse,deepanjanroy/lighthouse,deepanjanroy/lighthouse,ev1stensberg/lighthouse,deepanjanroy/lighthouse,GoogleChrome/lighthouse,wardpeet/lighthouse,umaar/lighthouse,mixed/lighthouse,deepanjanroy/lighthouse,mixed/lighthouse,wardpeet/lighthouse