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

net/base/test_completion_callback.h

 // Copyright (c) 2006-2008 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 NET_BASE_TEST_COMPLETION_CALLBACK_H_
 #define NET_BASE_TEST_COMPLETION_CALLBACK_H_
 #pragma once
 
-#include "base/callback.h"
+#include "base/callback_old.h"
+#include "base/tuple.h"
 
 //-----------------------------------------------------------------------------
 // completion callback helper
 
 // A helper class for completion callbacks, designed to make it easy to run
 // tests involving asynchronous operations.  Just call WaitForResult to wait
 // for the asynchronous operation to complete.
 //
 // NOTE: Since this runs a message loop to wait for the completion callback,
 // there could be other side-effects resulting from WaitForResult.  For this
@@ skipping 12 matching lines @@
 
   virtual void RunWithParams(const Tuple1<int>& params);
 
  private:
   int result_;
   bool have_result_;
   bool waiting_for_result_;
 };
 
 #endif  // NET_BASE_TEST_COMPLETION_CALLBACK_H_