Update behavior of one-click infobar to remove modal dialog, add "undo".

chrome/browser/ui/sync/one_click_signin_sync_starter.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_SYNC_STARTER_H_
 #define CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_SYNC_STARTER_H_
 #pragma once
 
 #include <string>
 
 #include "chrome/browser/signin/signin_tracker.h"
 
 class Profile;
 
 // Waits for successful singin notification from the signin manager and then
 // starts the sync machine.  Instances of this class delete themselves once
 // the job is done.
 class OneClickSigninSyncStarter : public SigninTracker::Observer {
  public:
+  enum StartSyncMode {SYNC_WITH_DEFAULT_SETTINGS, CONFIGURE_SYNC_FIRST };
+
   OneClickSigninSyncStarter(Profile* profile,
                             const std::string& session_index,
                             const std::string& email,
                             const std::string& password,
-                            bool use_default_settings);
+                            StartSyncMode start_mode);
 
  private:
   virtual ~OneClickSigninSyncStarter();
 
   // content::SigninTracker::Observer override.
   virtual void GaiaCredentialsValid() OVERRIDE;
   virtual void SigninFailed(const GoogleServiceAuthError& error) OVERRIDE;
   virtual void SigninSuccess() OVERRIDE;
 
   Profile* const profile_;
   SigninTracker signin_tracker_;
-  bool use_default_settings_;
+  StartSyncMode start_mode_;
 
   DISALLOW_COPY_AND_ASSIGN(OneClickSigninSyncStarter);
 };
 
 
 #endif  // CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_SYNC_STARTER_H_