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

remoting/jingle_glue/iq_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 REMOTING_JINGLE_GLUE_IQ_REQUEST_H_
 #define REMOTING_JINGLE_GLUE_IQ_REQUEST_H_
 
 #include <map>
 #include <string>
 #include <vector>
 
-#include "base/callback.h"
+#include "base/callback_old.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/weak_ptr.h"
 #include "remoting/jingle_glue/xmpp_proxy.h"
 #include "third_party/libjingle/source/talk/base/sigslot.h"
 #include "third_party/libjingle/source/talk/xmpp/xmppengine.h"
 
 class MessageLoop;
 class Task;
 
 namespace buzz {
@@ skipping 221 matching lines @@
 
   scoped_ptr<JavascriptIqRequest> request_;
   cricket::SessionManager* session_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionStartRequest);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_JINGLE_GLUE_IQ_REQUEST_H_