iwyu: Use callback_old.h where appropriate, part 2.

chrome/browser/remoting/directory_add_request.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_REMOTING_DIRECTORY_ADD_REQUEST_H_
 #define CHROME_BROWSER_REMOTING_DIRECTORY_ADD_REQUEST_H_
 
 #include <string>
 
-#include "base/callback.h"
+#include "base/callback_old.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/common/remoting/chromoting_host_info.h"
 #include "chrome/common/net/url_fetcher.h"
 #include "googleurl/src/gurl.h"
 
 namespace remoting {
 
 // A class implements REST API insert call for the Chromoting directory service.
 class DirectoryAddRequest : public URLFetcher::Delegate {
  public:
@@ skipping 45 matching lines @@
   net::URLRequestContextGetter* getter_;
   scoped_ptr<DoneCallback> done_callback_;
   scoped_ptr<URLFetcher> fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectoryAddRequest);
 };
 
 }  // namespace remoting
 
 #endif  // CHROME_BROWSER_REMOTING_DIRECTORY_ADD_REQUEST_H_