When the user navigates to the home page, make sure to set the RLZ string

chrome/browser/ui/browser.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_BROWSER_H_
 #define CHROME_BROWSER_UI_BROWSER_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 1000 matching lines @@
 
   // Updates commands for enabling developer tools.
   void UpdateCommandsForDevTools();
 
   // Updates commands for bookmark editing.
   void UpdateCommandsForBookmarkEditing();
 
   // Updates commands that affect the bookmark bar.
   void UpdateCommandsForBookmarkBar();
 
+  // Set the preference that indicates that the home page has been changed.
+  void MarkHomePageAsChanged(PrefService* pref_service);
+
   // Update commands whose state depends on whether the window is in fullscreen
   // mode.
   void UpdateCommandsForFullscreenMode(bool is_fullscreen);
 
   // Updates the printing command state.
   void UpdatePrintingState(int content_restrictions);
 
   // Updates the save-page-as command state.
   void UpdateSaveAsState(int content_restrictions);
 
@@ skipping 344 matching lines @@
   // Tab to notify when the browser exits fullscreen mode.
   TabContentsWrapper* fullscreened_tab_;
 
   // True if the current tab is in fullscreen mode.
   bool tab_caused_fullscreen_;
 
   DISALLOW_COPY_AND_ASSIGN(Browser);
 };
 
 #endif  // CHROME_BROWSER_UI_BROWSER_H_