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

chrome/browser/extensions/extension_tabs_module.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/extensions/extension_tabs_module.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/base64.h"
@@ skipping 1066 matching lines @@
           new ExtensionMsg_ExecuteCode(render_view_host->routing_id(),
                                        params));
 
       Observe(contents->tab_contents());
       AddRef();  // balanced in Observe()
 
       return true;
     }
 
     controller.LoadURL(
-        url, GURL(), content::PAGE_TRANSITION_LINK, std::string());
+        url, content::Referrer(), content::PAGE_TRANSITION_LINK, std::string());
 
     // The URL of a tab contents never actually changes to a JavaScript URL, so
     // this check only makes sense in other cases.
     if (!url.SchemeIs(chrome::kJavaScriptScheme))
       DCHECK_EQ(url.spec(), contents->tab_contents()->GetURL().spec());
   }
 
   bool active = false;
   // TODO(rafaelw): Setting |active| from js doesn't make much sense.
   // Move tab selection management up to window.
@@ skipping 517 matching lines @@
   // called for every API call the extension made.
   GotLanguage(language);
 }
 
 void DetectTabLanguageFunction::GotLanguage(const std::string& language) {
   result_.reset(Value::CreateStringValue(language.c_str()));
   SendResponse(true);
 
   Release();  // Balanced in Run()
 }