Replace the GURL referrer field of OpenURLParams with a content::Referrer

chrome/browser/download/download_shelf_context_menu.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/download/download_shelf_context_menu.h"
 
 #include "chrome/browser/download/download_item_model.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/ui/browser_list.h"
@@ skipping 93 matching lines @@
       download_item_->Delete(DownloadItem::DELETE_DUE_TO_USER_DISCARD);
       break;
     case KEEP:
       download_item_->DangerousDownloadValidated();
       break;
     case LEARN_MORE: {
       Browser* browser = BrowserList::GetLastActive();
       DCHECK(browser && browser->is_type_tabbed());
       GURL learn_more_url(chrome::kDownloadScanningLearnMoreURL);
       OpenURLParams params(google_util::AppendGoogleLocaleParam(learn_more_url),
-                           GURL(), NEW_FOREGROUND_TAB,
+                           content::Referrer(), NEW_FOREGROUND_TAB,
                            content::PAGE_TRANSITION_TYPED, false);
       browser->OpenURL(params);
       break;
     }
     default:
       NOTREACHED();
   }
 }
 
 bool DownloadShelfContextMenu::GetAcceleratorForCommandId(
@@ skipping 86 matching lines @@
   malicious_download_menu_model_->AddItemWithStringId(
       DISCARD, IDS_DOWNLOAD_MENU_DISCARD);
   malicious_download_menu_model_->AddItemWithStringId(
       KEEP, IDS_DOWNLOAD_MENU_KEEP);
   malicious_download_menu_model_->AddSeparator();
   malicious_download_menu_model_->AddItemWithStringId(
       LEARN_MORE, IDS_DOWNLOAD_MENU_LEARN_MORE);
 
   return malicious_download_menu_model_.get();
 }