function getCorrectedIEVersionByNavigator() {
  const ua = navigator.userAgent;
  if (/Trident/.test(ua) || /MSIE/.test(ua)) {
    return getIEVersion(ua);
  } else {
    return NOT_IE;
  }
}
Correct the actual IE version based on the Trident version in the user agent
string.  This adjusts for IE's "compatiblity modes".
@return {number}