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 462db56955865e8d4f034b7a052624b369480ffb..4064089c639a1327eb8d65d54eeb710132155df6 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::generateReferrerHeader(originDocument.referrerPolicy(), url, originDocument.outgoingReferrer()));
     remoteFrameClient()->navigate(request, lockBackForwardList);
 }