[net/dns] Rename SystemHostResolverProc and CallSystemHostResolverProc.

net/dns/host_resolver_proc.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_DNS_HOST_RESOLVER_PROC_H_
 #define NET_DNS_HOST_RESOLVER_PROC_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 66 matching lines @@
   static HostResolverProc* default_proc_;
 
   DISALLOW_COPY_AND_ASSIGN(HostResolverProc);
 };
 
 // Resolves |host| to an address list, using the system's default host resolver.
 // (i.e. this calls out to getaddrinfo()). If successful returns OK and fills
 // |addrlist| with a list of socket addresses. Otherwise returns a
 // network error code, and fills |os_error| with a more specific error if it
 // was non-NULL.
-NET_EXPORT_PRIVATE int SystemHostResolverProc(
+NET_EXPORT_PRIVATE int SystemHostResolverCall(
     const std::string& host,
     AddressFamily address_family,
     HostResolverFlags host_resolver_flags,
     AddressList* addrlist,
     int* os_error);
 
+// Wraps call to SystemHostResolverCall as an instance of HostResolverProc.
+class SystemHostResolverProc : public HostResolverProc {
+ public:
+  SystemHostResolverProc();
+  virtual int Resolve(const std::string& hostname,
+                      AddressFamily address_family,
+                      HostResolverFlags host_resolver_flags,
+                      AddressList* addr_list,
+                      int* os_error) OVERRIDE;
+ protected:
+  virtual ~SystemHostResolverProc();
+
+  DISALLOW_COPY_AND_ASSIGN(SystemHostResolverProc);
+};
+
 }  // namespace net
 
 #endif  // NET_DNS_HOST_RESOLVER_PROC_H_