fix: BroadcastChannel method not found when run on dart.library.io#97

terrier989 merged 4 commits intodint-dev:masterdint-dev/universal_html:masterfrom

dab246:fix-broadcast-channel-not-found-when-compile-on-mobiledab246/universal_html:fix-broadcast-channel-not-found-when-compile-on-mobileCopy head branch name to clipboard