net: move host_resolver files from net/base to net/dns

net/dns/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_
+#ifndef NET_DNS_SINGLE_REQUEST_HOST_RESOLVER_H_
+#define NET_DNS_SINGLE_REQUEST_HOST_RESOLVER_H_
 
-#include "net/base/host_resolver.h"
+#include "net/dns/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);
@@ skipping 27 matching lines @@
   CompletionCallback cur_request_callback_;
 
   // Completion callback for when request to |resolver_| completes.
   CompletionCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(SingleRequestHostResolver);
 };
 
 }  // namespace net
 
-#endif  // NET_BASE_SINGLE_REQUEST_HOST_RESOLVER_H_
+#endif  // NET_DNS_SINGLE_REQUEST_HOST_RESOLVER_H_