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

net/dns/mapped_host_resolver.h

 // Copyright (c) 2012 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_MAPPED_HOST_RESOLVER_H_
-#define NET_BASE_MAPPED_HOST_RESOLVER_H_
+#ifndef NET_DNS_MAPPED_HOST_RESOLVER_H_
+#define NET_DNS_MAPPED_HOST_RESOLVER_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "net/base/host_mapping_rules.h"
-#include "net/base/host_resolver.h"
 #include "net/base/net_export.h"
+#include "net/dns/host_resolver.h"
 
 namespace net {
 
 // This class wraps an existing HostResolver instance, but modifies the
 // request before passing it off to |impl|. This is different from
 // MockHostResolver which does the remapping at the HostResolverProc
 // layer, so it is able to preserve the effectiveness of the cache.
 class NET_EXPORT MappedHostResolver : public HostResolver {
  public:
   // Creates a MappedHostResolver that forwards all of its requests through
@@ skipping 38 matching lines @@
   // the network error code that the hostname's resolution mapped to.
   int ApplyRules(RequestInfo* info) const;
 
   scoped_ptr<HostResolver> impl_;
 
   HostMappingRules rules_;
 };
 
 }  // namespace net
 
-#endif  // NET_BASE_MAPPED_HOST_RESOLVER_H_
+#endif  // NET_DNS_MAPPED_HOST_RESOLVER_H_