Plumb the referrer throughout the OpenURL APIs....

chrome/browser/views/info_bar_alternate_nav_url_view.cc

 // Copyright (c) 2006-2008 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/views/info_bar_alternate_nav_url_view.h"
 
 #include "chrome/app/theme/theme_resources.h"
 #include "chrome/browser/web_contents.h"
 #include "chrome/browser/views/event_utils.h"
 #include "chrome/browser/views/info_bar_view.h"
@@ skipping 42 matching lines @@
   // in the other order would be problematic if navigation synchronously closed
   // the bar, as on return from the call, |this| would not exist, and calling
   // Close() would corrupt memory).  This means we need to save off all members
   // we need before calling Close(), which destroys us.
   PageNavigator* const navigator =
       static_cast<InfoBarView*>(GetParent())->web_contents();
   const GURL gurl(alternate_nav_url_);
 
   BeginClose();
 
-  navigator->OpenURL(gurl, event_utils::DispositionFromEventFlags(event_flags),
+  navigator->OpenURL(gurl, GURL(),
+                     event_utils::DispositionFromEventFlags(event_flags),
                      // Pretend the user typed this URL, so that navigating to
                      // it will be the default action when it's typed again in
                      // the future.
                      PageTransition::TYPED);
 }