Add removal of Network Information API
    
    See https://github.com/brave/brave-browser/issues/20122
    
    Potential improvements: return a generic value, return a farbled generic
    value. Or modify the values somehow.
    
    Radek observed:
    * downlink is never greater than 10, sometimes values like 9.3
    * downlinkMax can be greater than 10, e.g. 100/infinity
    * effectiveType: computed from rtt and downlink
    * saveData can be important for users trying to limit downloaded data