Test that we don't attempt to revalidate the cached main resource on history navigation

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS no-cache subresource was cached and used for a back navigation
PASS no-cache subresource was refetched with a reload
PASS no-cache subresource was refetched with a normal navigation
PASS successfullyParsed is true

TEST COMPLETE