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

chrome/browser/instant/instant_loader.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/instant/instant_loader.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 671 matching lines @@
             complete_suggested_text_.substr(user_text_.size());
       }
     } else {
       LoadInstantURL(tab_contents, template_url, transition_type, user_text_,
                      verbatim);
     }
   } else {
     DCHECK(template_url_id_ == 0);
     preview_tab_contents_delegate_->PrepareForNewLoad();
     frame_load_observer_.reset(NULL);
-    preview_contents_->controller().LoadURL(url_, GURL(), transition_type,
-                                            std::string());
+    preview_contents_->controller().LoadURL(url_, content::Referrer(),
+                                            transition_type, std::string());
   }
   return true;
 }
 
 void InstantLoader::SetOmniboxBounds(const gfx::Rect& bounds) {
   if (omnibox_bounds_ == bounds)
     return;
 
   // Don't update the page while the mouse is down. http://crbug.com/71952
   if (IsMouseDownFromActivate())
@@ skipping 361 matching lines @@
   // This uses an empty string for the replacement text as the url doesn't
   // really have the search params, but we need to use the replace
   // functionality so that embeded tags (like {google:baseURL}) are escaped
   // correctly.
   // TODO(sky): having to use a replaceable url is a bit of a hack here.
   GURL instant_url(template_url->instant_url()->ReplaceSearchTermsUsingProfile(
       tab_contents->profile(), *template_url, string16(), -1, string16()));
   CommandLine* cl = CommandLine::ForCurrentProcess();
   if (cl->HasSwitch(switches::kInstantURL))
     instant_url = GURL(cl->GetSwitchValueASCII(switches::kInstantURL));
-  preview_contents_->controller().LoadURL(instant_url, GURL(), transition_type,
-                                          std::string());
+  preview_contents_->controller().LoadURL(instant_url, content::Referrer(),
+                                          transition_type, std::string());
   RenderViewHost* host = preview_contents_->render_view_host();
   preview_contents_->tab_contents()->HideContents();
 
   // If user_text is empty, this must be a preload of the search homepage. In
   // that case, send down a SearchBoxResize message, which will switch the page
   // to "search results" UI. This avoids flicker when the page is shown with
   // results. In addition, we don't want the page accidentally causing the
   // preloaded page to be displayed yet (by calling setSuggestions), so don't
   // send a SearchBoxChange message.
   if (user_text.empty()) {
     host->Send(new ChromeViewMsg_SearchBoxResize(
         host->routing_id(), GetOmniboxBoundsInTermsOfPreview()));
   } else {
     host->Send(new ChromeViewMsg_SearchBoxChange(
         host->routing_id(), user_text, verbatim, 0, 0));
   }
 
   frame_load_observer_.reset(new FrameLoadObserver(
       this, preview_contents()->tab_contents(), user_text, verbatim));
 }