Make generateReferrerHeader() return a Referrer instead of a String

Source/web/WebSecurityPolicy.cpp

 /*
  * Copyright (C) 2009 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 86 matching lines @@
         destinationHost, allowDestinationSubdomains);
 }
 
 void WebSecurityPolicy::resetOriginAccessWhitelists()
 {
     SecurityPolicy::resetOriginAccessWhitelists();
 }
 
 WebString WebSecurityPolicy::generateReferrerHeader(WebReferrerPolicy referrerPolicy, const WebURL& url, const WebString& referrer)
 {
-    return SecurityPolicy::generateReferrerHeader(static_cast<ReferrerPolicy>(referrerPolicy), url, referrer);
+    return SecurityPolicy::generateReferrer(static_cast<ReferrerPolicy>(referrerPolicy), url, referrer).referrer;
 }
 
 void WebSecurityPolicy::registerURLSchemeAsNotAllowingJavascriptURLs(const WebString& scheme)
 {
     SchemeRegistry::registerURLSchemeAsNotAllowingJavascriptURLs(scheme);
 }
 
 } // namespace blink