Use the new CanonicalizeHostVerbose() function.

net/proxy/proxy_config.cc

 // Copyright (c) 2006-2008 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/proxy/proxy_config.h"
 
 #include "base/string_tokenizer.h"
 #include "base/string_util.h"
 
 namespace net {
@@ skipping 79 matching lines @@
     return &proxy_for_ftp;
   return NULL;  // No mapping for this scheme.
 }
 
 namespace {
 
 // Returns true if the given string represents an IP address.
 bool IsIPAddress(const std::string& domain) {
   // From GURL::HostIsIPAddress()
   url_canon::RawCanonOutputT<char, 128> ignored_output;
-  url_parse::Component ignored_component;
+  url_canon::CanonHostInfo host_info;
   url_parse::Component domain_comp(0, domain.size());
-  return url_canon::CanonicalizeIPAddress(domain.c_str(), domain_comp,
-                                          &ignored_output,
-                                          &ignored_component);
+  url_canon::CanonicalizeIPAddress(domain.c_str(), domain_comp,
+                                   &ignored_output, &host_info);
+  return host_info.IsIPAddress();
 }
 
 }  // namespace
 
 void ProxyConfig::ParseNoProxyList(const std::string& no_proxy) {
   proxy_bypass.clear();
   if (no_proxy.empty())
     return;
   // Traditional semantics:
   // A single "*" is specifically allowed and unproxies anything.
@@ skipping 99 matching lines @@
          it != config.proxy_bypass.end(); ++it) {
       out << "    " << *it << "\n";
     }
     out << "  }\n";
   }
 
   out << "  id: " << config.id() << "\n"
       << "}";
   return out;
 }