Change NavigationController::LoadURL to take a Referrer class instead of a GURL as referrer

chrome/browser/ui/gtk/notifications/balloon_view_gtk.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/gtk/notifications/balloon_view_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include <string>
 #include <vector>
@@ skipping 330 matching lines @@
   notification_registrar_.Add(this,
       chrome::NOTIFICATION_NOTIFY_BALLOON_DISCONNECTED,
       content::Source<Balloon>(balloon));
 }
 
 void BalloonViewImpl::Update() {
   DCHECK(html_contents_.get()) << "BalloonView::Update called before Show";
   if (!html_contents_->tab_contents())
     return;
   html_contents_->tab_contents()->controller().LoadURL(
-      balloon_->notification().content_url(), GURL(),
+      balloon_->notification().content_url(), content::Referrer(),
       content::PAGE_TRANSITION_LINK, std::string());
 }
 
 gfx::Point BalloonViewImpl::GetContentsOffset() const {
   return gfx::Point(kLeftShadowWidth + kLeftMargin,
                     GetShelfHeight() + kTopShadowWidth + kTopMargin);
 }
 
 int BalloonViewImpl::GetShelfHeight() const {
   // TODO(johnnyg): add scaling here.
@@ skipping 115 matching lines @@
                    weak_factory_.GetWeakPtr(),
                    false));
   }
 }
 
 gboolean BalloonViewImpl::OnDestroy(GtkWidget* widget) {
   frame_container_ = NULL;
   Close(false);
   return FALSE;  // Propagate.
 }