Tests the signed exchange information are available when the navigation failed.

about:blank:1 Validity URL must be same-origin with request URL.
about:blank:1 Failed to parse SignedExchange header.
* http://127.0.0.1:8000/loading/sxg/resources/sxg-invalid-validity-url.sxg
  failed: false
  statusCode: 200
  resourceType: signed-exchange
  SignedExchangeInfo
    Error: {"message":"Validity URL must be same-origin with request URL."}
    Error: {"message":"Failed to parse SignedExchange header."}
* https://127.0.0.1:8443/loading/sxg/resources/inner-url.html
  failed: false
  statusCode: 200
  resourceType: document