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

chrome/browser/background/background_contents_service.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/background/background_contents_service.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/string_util.h"
@@ skipping 438 matching lines @@
   BackgroundContents* contents = CreateBackgroundContents(
       SiteInstance::CreateSiteInstanceForURL(profile, url),
       MSG_ROUTING_NONE,
       profile,
       frame_name,
       application_id);
 
   // TODO(atwilson): Create RenderViews asynchronously to avoid increasing
   // startup latency (http://crbug.com/47236).
   contents->tab_contents()->controller().LoadURL(
-      url, GURL(), content::PAGE_TRANSITION_LINK, std::string());
+      url, content::Referrer(), content::PAGE_TRANSITION_LINK, std::string());
 }
 
 BackgroundContents* BackgroundContentsService::CreateBackgroundContents(
     SiteInstance* site,
     int routing_id,
     Profile* profile,
     const string16& frame_name,
     const string16& application_id) {
   BackgroundContents* contents = new BackgroundContents(site, routing_id, this);
 
@@ skipping 102 matching lines @@
     TabContents* new_contents,
     WindowOpenDisposition disposition,
     const gfx::Rect& initial_pos,
     bool user_gesture) {
   Browser* browser = BrowserList::GetLastActiveWithProfile(
       Profile::FromBrowserContext(new_contents->browser_context()));
   if (!browser)
     return;
   browser->AddTabContents(new_contents, disposition, initial_pos, user_gesture);
 }