main frame - didStartProvisionalLoadForFrame
main frame - didCommitLoadForFrame
main frame - didFinishDocumentLoadForFrame
main frame - didHandleOnloadEventsForFrame
main frame - didFinishLoadForFrame
http://127.0.0.1:8000/loading/main-resource-delegates-on-back-navigation.html - didFinishLoading
main frame - willPerformClientRedirectToURL: http://127.0.0.1:8000/loading/resources/page-go-back-onload.html 
main frame - didStartProvisionalLoadForFrame
http://127.0.0.1:8000/loading/resources/page-go-back-onload.html - willSendRequest <NSURLRequest URL http://127.0.0.1:8000/loading/resources/page-go-back-onload.html, main document URL http://127.0.0.1:8000/loading/resources/page-go-back-onload.html, http method GET> redirectResponse (null)
http://127.0.0.1:8000/loading/resources/page-go-back-onload.html - didReceiveResponse <NSURLResponse http://127.0.0.1:8000/loading/resources/page-go-back-onload.html, http status code 200>
main frame - didCancelClientRedirectForFrame
main frame - didCommitLoadForFrame
main frame - didFinishDocumentLoadForFrame
main frame - didHandleOnloadEventsForFrame
main frame - didFinishLoadForFrame
http://127.0.0.1:8000/loading/resources/page-go-back-onload.html - didFinishLoading
main frame - didStartProvisionalLoadForFrame
http://127.0.0.1:8000/loading/main-resource-delegates-on-back-navigation.html - willSendRequest <NSURLRequest URL http://127.0.0.1:8000/loading/main-resource-delegates-on-back-navigation.html, main document URL http://127.0.0.1:8000/loading/main-resource-delegates-on-back-navigation.html, http method GET> redirectResponse (null)
http://127.0.0.1:8000/loading/main-resource-delegates-on-back-navigation.html - didReceiveResponse <NSURLResponse http://127.0.0.1:8000/loading/main-resource-delegates-on-back-navigation.html, http status code 200>
main frame - didCommitLoadForFrame
http://127.0.0.1:8000/loading/main-resource-delegates-on-back-navigation.html - didFinishLoading
main frame - didFinishLoadForFrame
main frame - willPerformClientRedirectToURL: http://127.0.0.1:8000/loading/resources/page-go-back-onload.html 
main frame - didStartProvisionalLoadForFrame
http://127.0.0.1:8000/loading/resources/page-go-back-onload.html - willSendRequest <NSURLRequest URL http://127.0.0.1:8000/loading/resources/page-go-back-onload.html, main document URL http://127.0.0.1:8000/loading/resources/page-go-back-onload.html, http method GET> redirectResponse (null)
http://127.0.0.1:8000/loading/resources/page-go-back-onload.html - didReceiveResponse <NSURLResponse http://127.0.0.1:8000/loading/resources/page-go-back-onload.html, http status code 200>
main frame - didCancelClientRedirectForFrame
main frame - didCommitLoadForFrame
http://127.0.0.1:8000/loading/resources/page-go-back-onload.html - didFinishLoading
main frame - didFinishDocumentLoadForFrame
main frame - didHandleOnloadEventsForFrame
main frame - didFinishLoadForFrame
main frame - didStartProvisionalLoadForFrame
http://127.0.0.1:8000/loading/main-resource-delegates-on-back-navigation.html - willSendRequest <NSURLRequest URL http://127.0.0.1:8000/loading/main-resource-delegates-on-back-navigation.html, main document URL http://127.0.0.1:8000/loading/main-resource-delegates-on-back-navigation.html, http method GET> redirectResponse (null)
http://127.0.0.1:8000/loading/main-resource-delegates-on-back-navigation.html - didReceiveResponse <NSURLResponse http://127.0.0.1:8000/loading/main-resource-delegates-on-back-navigation.html, http status code 200>
main frame - didCommitLoadForFrame
http://127.0.0.1:8000/loading/main-resource-delegates-on-back-navigation.html - didFinishLoading
main frame - didFinishLoadForFrame
Test that main resource load delegates are the same when page cache is enabled and disabled