Make generateReferrerHeader() return a Referrer instead of a String

Source/platform/Prerender.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 20 matching lines @@
 
 #include "config.h"
 #include "platform/Prerender.h"
 
 #include "platform/PrerenderClient.h"
 #include "public/platform/WebPrerender.h"
 #include "public/platform/WebPrerenderingSupport.h"
 
 namespace blink {
 
-PassRefPtr<Prerender> Prerender::create(PrerenderClient* client, const KURL& url, unsigned relTypes, const String& referrer, ReferrerPolicy policy)
+PassRefPtr<Prerender> Prerender::create(PrerenderClient* client, const KURL& url, unsigned relTypes, const Referrer& referrer)
 {
-    return adoptRef(new Prerender(client, url, relTypes, referrer, policy));
+    return adoptRef(new Prerender(client, url, relTypes, referrer));
 }
 
-Prerender::Prerender(PrerenderClient* client, const KURL& url, const unsigned relTypes, const String& referrer, ReferrerPolicy policy)
+Prerender::Prerender(PrerenderClient* client, const KURL& url, const unsigned relTypes, const Referrer& referrer)
     : m_client(client)
     , m_url(url)
     , m_relTypes(relTypes)
     , m_referrer(referrer)
-    , m_referrerPolicy(policy)
 {
 }
 
 Prerender::~Prerender()
 {
 }
 
 void Prerender::removeClient()
 {
     m_client = 0;
@@ skipping 41 matching lines @@
         m_client->didSendLoadForPrerender();
 }
 
 void Prerender::didSendDOMContentLoadedForPrerender()
 {
     if (m_client)
         m_client->didSendDOMContentLoadedForPrerender();
 }
 
 }