base::Bind: Convert HostResolver::Resolve.

net/base/single_request_host_resolver.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 NET_BASE_SINGLE_REQUEST_HOST_RESOLVER_H_
 #define NET_BASE_SINGLE_REQUEST_HOST_RESOLVER_H_
 #pragma once
 
 #include "net/base/host_resolver.h"
 
 namespace net {
 
 // This class represents the task of resolving a hostname (or IP address
 // literal) to an AddressList object.  It wraps HostResolver to resolve only a
 // single hostname at a time and cancels this request when going out of scope.
 class NET_EXPORT SingleRequestHostResolver {
  public:
   // |resolver| must remain valid for the lifetime of |this|.
   explicit SingleRequestHostResolver(HostResolver* resolver);
 
   // If a completion callback is pending when the resolver is destroyed, the
   // host resolution is cancelled, and the completion callback will not be
   // called.
   ~SingleRequestHostResolver();
 
   // Resolves the given hostname (or IP address literal), filling out the
   // |addresses| object upon success. See HostResolver::Resolve() for details.
   int Resolve(const HostResolver::RequestInfo& info,
               AddressList* addresses,
-              OldCompletionCallback* callback,
+              const CompletionCallback& callback,
               const BoundNetLog& net_log);
 
   // Cancels the in-progress request, if any. This prevents the callback
   // from being invoked. Resolve() can be called again after cancelling.
   void Cancel();
 
  private:
   // Callback for when the request to |resolver_| completes, so we dispatch
   // to the user's callback.
   void OnResolveCompletion(int result);
 
   // The actual host resolver that will handle the request.
   HostResolver* const resolver_;
 
   // The current request (if any).
   HostResolver::RequestHandle cur_request_;
-  OldCompletionCallback* cur_request_callback_;
+  CompletionCallback cur_request_callback_;
 
   // Completion callback for when request to |resolver_| completes.
-  OldCompletionCallbackImpl<SingleRequestHostResolver> callback_;
+  CompletionCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(SingleRequestHostResolver);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_SINGLE_REQUEST_HOST_RESOLVER_H_