Reland of [chromedriver] Listen on IPv6 on IPv6-only hosts (part 2).

chrome/test/chromedriver/net/net_util.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 CHROME_TEST_CHROMEDRIVER_NET_NET_UTIL_H_
 #define CHROME_TEST_CHROMEDRIVER_NET_NET_UTIL_H_
 
 #include <string>
 
 class URLRequestContextGetter;
 
 class NetAddress {
  public:
   NetAddress();  // Creates an invalid address.
-  explicit NetAddress(int port);  // Host is set to 127.0.0.1.
+  explicit NetAddress(int port);  // Host is set to localhost.
   NetAddress(const std::string& host, int port);
   ~NetAddress();
 
   bool IsValid() const;
 
   // Returns host:port.
   std::string ToString() const;
 
   const std::string& host() const;
   int port() const;
 
  private:
   std::string host_;
   int port_;
 };
 
 // Synchronously fetches data from a GET HTTP request to the given URL.
 // Returns true if response is 200 OK and sets response body to |response|.
 bool FetchUrl(const std::string& url,
               URLRequestContextGetter* getter,
               std::string* response);
 
 #endif  // CHROME_TEST_CHROMEDRIVER_NET_NET_UTIL_H_