Revert 114494 - Remove BindStateHolder and have Bind() return a Callback<> object directly.

net/base/completion_callback.cc

Index: net/base/completion_callback.cc
===================================================================
--- net/base/completion_callback.cc	(revision 114494)
+++ net/base/completion_callback.cc	(working copy)
@@ -1,14 +0,0 @@
-// 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.
-
-#include "net/base/completion_callback.h"
-
-namespace net {
-
-void OldCompletionCallbackAdapter(OldCompletionCallback* old_callback,
-                                  int rv) {
-  old_callback->Run(rv);
-}
-
-}  //  namespace net