Remove http.headers.Accept-Charset (#10114)
Remove http.headers.Accept-Charset (#10114)

https://github.com/mdn/browser-compat-data/pull/9610#issuecomment-811859732
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data