Remove interface probing for IPv6 support from HostResolverImpl

net/base/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 NET_BASE_NET_UTIL_H_
 #define NET_BASE_NET_UTIL_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
@@ skipping 401 matching lines @@
  public:
   ScopedPortException(int port);
   ~ScopedPortException();
 
  private:
   int port_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedPortException);
 };
 
-// These are used for UMA histograms.  Any new values must be added to the end.
-enum IPv6SupportStatus {
-  IPV6_CANNOT_CREATE_SOCKETS,
-  IPV6_CAN_CREATE_SOCKETS,  // Obsolete
-  IPV6_GETIFADDRS_FAILED,
-  IPV6_GLOBAL_ADDRESS_MISSING,
-  IPV6_GLOBAL_ADDRESS_PRESENT,
-  IPV6_INTERFACE_ARRAY_TOO_SHORT,
-  IPV6_SUPPORT_MAX  // Bounding value for enumeration.  Also used for case
-                    // where detection is not supported.
-};
-
-// Encapsulates the results of an IPv6 probe.
-struct NET_EXPORT IPv6SupportResult {
-  IPv6SupportResult(bool ipv6_supported,
-                    IPv6SupportStatus ipv6_support_status,
-                    int os_error);
-
-  // Serializes the results to a Value.  Caller takes ownership of the returned
-  // Value.
-  base::Value* ToNetLogValue(NetLog::LogLevel log_level) const;
-
-  bool ipv6_supported;
-  // Set to IPV6_SUPPORT_MAX if detection isn't supported.
-  IPv6SupportStatus ipv6_support_status;
-
-  // Error code from the OS, or zero if there was no error.
-  int os_error;
-};
-
-// Perform a simplistic test to see if IPv6 is supported by trying to create an
-// IPv6 socket.
-// TODO(jar): Make test more in-depth as needed.
-NET_EXPORT IPv6SupportResult TestIPv6Support();
-
 // Returns true if it can determine that only loopback addresses are configured.
 // i.e. if only 127.0.0.1 and ::1 are routable.
 // Also returns false if it cannot determine this.
 bool HaveOnlyLoopbackAddresses();
 
 // Returns AddressFamily of the address.
 NET_EXPORT_PRIVATE AddressFamily GetAddressFamily(
     const IPAddressNumber& address);
 
 // Parses an IP address literal (either IPv4 or IPv6) to its numeric value.
@@ skipping 94 matching lines @@
   WIFI_PHY_LAYER_PROTOCOL_UNKNOWN
 };
 
 // Characterize the PHY mode of the currently associated access point.
 // Currently only available on OS_WIN.
 NET_EXPORT WifiPHYLayerProtocol GetWifiPHYLayerProtocol();
 
 }  // namespace net
 
 #endif  // NET_BASE_NET_UTIL_H_