Tests that Preload.prefetchStatusUpdated is dispatched for prefetching a resource whose MIME type is not supported.
{
    method : Preload.prefetchStatusUpdated
    params : {
        initiatingFrameId : <string>
        key : {
            action : Prefetch
            loaderId : <string>
            url : https://127.0.0.1:8443/inspector-protocol/prefetch/resources/non_existent.bmp
        }
        pipelineId : <string>
        prefetchStatus : PrefetchNotFinishedInTime
        prefetchUrl : https://127.0.0.1:8443/inspector-protocol/prefetch/resources/non_existent.bmp
        requestId : <string>
        status : Running
    }
    sessionId : <string>
}
{
    method : Preload.prefetchStatusUpdated
    params : {
        initiatingFrameId : <string>
        key : {
            action : Prefetch
            loaderId : <string>
            url : https://127.0.0.1:8443/inspector-protocol/prefetch/resources/non_existent.bmp
        }
        pipelineId : <string>
        prefetchStatus : PrefetchFailedNon2XX
        prefetchUrl : https://127.0.0.1:8443/inspector-protocol/prefetch/resources/non_existent.bmp
        requestId : <string>
        status : Failure
    }
    sessionId : <string>
}