static isNonNetworkSvg(image) {
    const isSvg = UrlUtils.guessMimeType(image.src) === 'image/svg+xml';
    const urlScheme = image.src.slice(0, image.src.indexOf(':'));
    const isNonNetwork = UrlUtils.isNonNetworkProtocol(urlScheme);
    return isSvg && isNonNetwork;
  }
@param {LH.Artifacts.ImageElement} image
@return {boolean}