Apply CustomEvent polyfill in Android < 4.4, fixes #378
Apply CustomEvent polyfill in Android < 4.4, fixes #378
JakeChampion/polyfill-service,JakeChampion/polyfill-service,jonathan-fielding/polyfill-service,kdzwinel/polyfill-service,jonathan-fielding/polyfill-service,mcshaz/polyfill-service,jonathan-fielding/polyfill-service,kdzwinel/polyfill-service,mcshaz/polyfill-service,kdzwinel/polyfill-service,mcshaz/polyfill-service