Make generateReferrerHeader() return a Referrer instead of a String

Source/core/frame/RemoteFrame.cpp

Index: Source/core/frame/RemoteFrame.cpp
diff --git a/Source/core/frame/RemoteFrame.cpp b/Source/core/frame/RemoteFrame.cpp
index 19c25da7ab56b38d49bf4dac00c1b3d263e18a8a..65b704a3faa41fecbfc8e62c6ff73f8f97200b22 100644
--- a/Source/core/frame/RemoteFrame.cpp
+++ b/Source/core/frame/RemoteFrame.cpp
@@ -32,8 +32,7 @@ void RemoteFrame::navigate(Document& originDocument, const KURL& url, bool lockB
     // The process where this frame actually lives won't have sufficient information to determine
     // correct referrer, since it won't have access to the originDocument. Set it now.
     ResourceRequest request(url);
-    Referrer referrer(SecurityPolicy::generateReferrerHeader(originDocument.referrerPolicy(), url, originDocument.outgoingReferrer()), originDocument.referrerPolicy());
-    request.setHTTPReferrer(referrer);
+    request.setHTTPReferrer(SecurityPolicy::generateReferrer(originDocument.referrerPolicy(), url, originDocument.outgoingReferrer()));
     remoteFrameClient()->navigate(request, lockBackForwardList);
 }