change(firestore): close Firestore instance more gracefully when "Clear Site Data" button pressed in browser#9118

dconeybe wants to merge 5 commits intomainfirebase/firebase-js-sdk:mainfrom

dconeybe/ClearSiteDataTerminateFirestorefirebase/firebase-js-sdk:dconeybe/ClearSiteDataTerminateFirestoreCopy head branch name to clipboard