Bug 1269448 - Fix test assertions. r=mayhemer

MozReview-Commit-ID: HQyi9SJmIC2

netwerk/protocol/http/nsHttpChannel.cpp

@@ -1626,7 +1626,7 @@ nsHttpChannel::ProcessResponse()
     }
     if (referrer) {
         nsCOMPtr<nsILoadContextInfo> lci = GetLoadContextInfo(this);
-        mozilla::net::Predictor::UpdateCacheability(mReferrer, mURI, httpStatus,
+        mozilla::net::Predictor::UpdateCacheability(referrer, mURI, httpStatus,
                                                     mRequestHead, mResponseHead,
                                                     lci);
     }