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

Index: chrome/browser/ui/sync/one_click_signin_helper.h
diff --git a/chrome/browser/ui/sync/one_click_signin_helper.h b/chrome/browser/ui/sync/one_click_signin_helper.h
index e4da000b543d49a1903f5bf8815fc65e36e6fde7..33507c91ed57e793b1e715ddc27189171564c30b 100644
--- a/chrome/browser/ui/sync/one_click_signin_helper.h
+++ b/chrome/browser/ui/sync/one_click_signin_helper.h
@@ -113,6 +113,11 @@ class OneClickSigninHelper
                                     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>;