Remove interface probing for IPv6 support from HostResolverImpl

net/base/net_util.h

Index: net/base/net_util.h
diff --git a/net/base/net_util.h b/net/base/net_util.h
index c5d49fae244cf74829b83a4769785f646ef24ff7..c139760981cb835ecfa8f5b90ff8b6ff885920f7 100644
--- a/net/base/net_util.h
+++ b/net/base/net_util.h
@@ -419,41 +419,6 @@ class NET_EXPORT ScopedPortException {
   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.