Add Chromium versions for api.XMLHttpRequest.getAllResponseHeaders.lowercase (#12875)
Add Chromium versions for api.XMLHttpRequest.getAllResponseHeaders.lowercase (#12875)

This PR adds real values for Chromium (Chrome, Opera, Samsung Internet, WebView Android) for the `getAllResponseHeaders.lowercase` member of the `XMLHttpRequest` API, based upon commit history and date.

Commit: https://storage.googleapis.com/chromium-find-releases-static/99c.html#99c274ae8e7d366261dcfb89e0b98e733fb9d5f4
mdn/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data