Make generateReferrerHeader() return a Referrer instead of a String

Source/core/loader/FrameFetchContext.cpp

Index: Source/core/loader/FrameFetchContext.cpp
diff --git a/Source/core/loader/FrameFetchContext.cpp b/Source/core/loader/FrameFetchContext.cpp
index 3a5795e9cb7f4ad21372395b068979f974bb8f3d..e92962f0ab040469b45c473f0da8061218f047b6 100644
--- a/Source/core/loader/FrameFetchContext.cpp
+++ b/Source/core/loader/FrameFetchContext.cpp
@@ -73,12 +73,7 @@ void FrameFetchContext::addAdditionalRequestHeaders(Document* document, Resource
             outgoingOrigin = SecurityOrigin::createFromString(outgoingReferrer)->toString();
         }
 
-        outgoingReferrer = SecurityPolicy::generateReferrerHeader(referrerPolicy, request.url(), outgoingReferrer);
-        if (outgoingReferrer.isEmpty())
-            request.clearHTTPReferrer();
-        else
-            request.setHTTPReferrer(Referrer(outgoingReferrer, referrerPolicy));
-
+        request.setHTTPReferrer(SecurityPolicy::generateReferrerHeader(referrerPolicy, request.url(), outgoingReferrer));
         request.addHTTPOriginIfNeeded(AtomicString(outgoingOrigin));
     }