iwyu: Use callback_old.h where appropriate, part 1.

chrome/browser/favicon/favicon_service.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_FAVICON_FAVICON_SERVICE_H_
 #define CHROME_BROWSER_FAVICON_FAVICON_SERVICE_H_
 #pragma once
 
 #include <vector>
 
+#include "base/callback_old.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/task.h"
 #include "chrome/browser/history/history_types.h"
 #include "chrome/common/ref_counted_util.h"
 #include "content/browser/cancelable_request.h"
 
 class GURL;
 class Profile;
 
@@ skipping 76 matching lines @@
 
   Profile* profile_;
 
   // Helper to forward an empty result if we cannot get the history service.
   void ForwardEmptyResultAsync(GetFaviconRequest* request);
 
   DISALLOW_COPY_AND_ASSIGN(FaviconService);
 };
 
 #endif  // CHROME_BROWSER_FAVICON_FAVICON_SERVICE_H_