Tests that browser-initiated navigation honors Network.setCacheDisabled

Original navigation, should not be cached:
  responseReceived status: 200
  responseReceivedExtraInfo status: 200

Second navigation, should be cached:
  responseReceived status: 200
  responseReceivedExtraInfo status: undefined
  cached: true

Navigation with cache disabled:
  responseReceived status: 200
  responseReceivedExtraInfo status: 200
  cached: false