static isClearKeyWihRawKey_(drmInfo) {
    const licenseServerUri = drmInfo.licenseServerUri;
    if (!licenseServerUri) {
      return false;
    }
    return licenseServerUri.startsWith('data:application/json;base64,');
  }
@param {shaka.extern.DrmInfo} drmInfo
@return {boolean}
@private