Use callback_forward.h instead of callback.h where possible.

chrome/browser/importer/toolbar_importer_utils.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_IMPORTER_TOOLBAR_IMPORTER_UTILS_H_
 #define CHROME_BROWSER_IMPORTER_TOOLBAR_IMPORTER_UTILS_H_
 #pragma once
 
-#include "base/bind.h"
-#include "base/callback.h"
+#include "base/callback_forward.h"
 
 class Profile;
 
 namespace toolbar_importer_utils {
 
 // Currently the only configuration information we need is to check whether or
 // not the user currently has their GAIA cookie.  This is done by the function
 // exposed through the ToolbarImportUtils namespace.
 void IsGoogleGAIACookieInstalled(const base::Callback<void(bool)>& callback,
                                  Profile* profile);
 
 }  // namespace toolbar_importer_utils
 
 #endif  // CHROME_BROWSER_IMPORTER_TOOLBAR_IMPORTER_UTILS_H_