Make generateReferrerHeader() return a Referrer instead of a String

Source/web/WebLocalFrameImpl.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 906 matching lines @@
 bool WebLocalFrameImpl::isViewSourceModeEnabled() const
 {
     if (!frame())
         return false;
     return frame()->inViewSourceMode();
 }
 
 void WebLocalFrameImpl::setReferrerForRequest(WebURLRequest& request, const WebURL& referrerURL)
 {
     String referrer = referrerURL.isEmpty() ? frame()->document()->outgoingReferrer() : String(referrerURL.spec().utf16());
-    referrer = SecurityPolicy::generateReferrerHeader(frame()->document()->referrerPolicy(), request.url(), referrer);
-    if (referrer.isEmpty())
-        return;
-    request.setHTTPReferrer(referrer, static_cast<WebReferrerPolicy>(frame()->document()->referrerPolicy()));
+    request.toMutableResourceRequest().setHTTPReferrer(SecurityPolicy::generateReferrer(frame()->document()->referrerPolicy(), request.url(), referrer));
 }
 
 void WebLocalFrameImpl::dispatchWillSendRequest(WebURLRequest& request)
 {
     ResourceResponse response;
     frame()->loader().client()->dispatchWillSendRequest(0, 0, request.toMutableResourceRequest(), response);
 }
 
 WebURLLoader* WebLocalFrameImpl::createAssociatedURLLoader(const WebURLLoaderOptions& options)
 {
@@ skipping 976 matching lines @@
 
 void WebLocalFrameImpl::invalidateAll() const
 {
     ASSERT(frame() && frame()->view());
     FrameView* view = frame()->view();
     view->invalidateRect(view->frameRect());
     invalidateScrollbar();
 }
 
 } // namespace blink