Remove landing page from history when redirecting to NTP so that the back-button will work as expec…

chrome/browser/ui/sync/one_click_signin_helper.h

 // Copyright (c) 2012 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_SYNC_ONE_CLICK_SIGNIN_HELPER_H_
 #define CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_HELPER_H_
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
@@ skipping 95 matching lines @@
   static void InitializeFieldTrial();
 
   // Looks for the Google-Accounts-SignIn response header, and if found,
   // tries to display an infobar in the tab contents identified by the
   // child/route id.
   static void ShowInfoBarIfPossible(net::URLRequest* request,
                                     ProfileIOData* io_data,
                                     int child_id,
                                     int route_id);
 
+  // Remove the item currently at the top of the history list.  Due to
+  // limitations of the NavigationController, this cannot be done until
+  // a new page becomes "current".
+  static void RemoveCurrentHistoryItem(content::WebContents* web_contents);
+
  private:
   explicit OneClickSigninHelper(content::WebContents* web_contents);
   friend class content::WebContentsUserData<OneClickSigninHelper>;
   friend class OneClickSigninHelperTest;
   FRIEND_TEST_ALL_PREFIXES(OneClickSigninHelperTest,
                            ShowInfoBarUIThreadIncognito);
   FRIEND_TEST_ALL_PREFIXES(OneClickSigninHelperTest,
                            SigninFromWebstoreWithConfigSyncfirst);
   FRIEND_TEST_ALL_PREFIXES(OneClickSigninHelperTest,
                            ShowSigninBubbleAfterSigninComplete);
@@ skipping 108 matching lines @@
 
   // Whether a Gaia URL during the sign in process was not handled by the
   // dedicated sign in process.  This is set to false if at least one such
   // URL is detected.
   bool is_trusted_;
 
   DISALLOW_COPY_AND_ASSIGN(OneClickSigninHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_HELPER_H_