Fix a -Wunused-function warning in gn builds.

webrtc/base/network.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 101 matching lines @@
     case ADAPTER_TYPE_VPN:
       return "VPN";
     case ADAPTER_TYPE_LOOPBACK:
       return "Loopback";
     default:
       RTC_DCHECK(false) << "Invalid type " << type;
       return std::string();
   }
 }
 
+#if !defined(__native_client__)
 bool IsIgnoredIPv6(const InterfaceAddress& ip) {
   if (ip.family() != AF_INET6) {
     return false;
   }
 
   // Link-local addresses require scope id to be bound successfully.
   // However, our IPAddress structure doesn't carry that so the
   // information is lost and causes binding failure.
   if (IPIsLinkLocal(ip)) {
     return true;
   }
 
   // Any MAC based IPv6 should be avoided to prevent the MAC tracking.
   if (IPIsMacBased(ip)) {
     return true;
   }
 
   // Ignore deprecated IPv6.
   if (ip.ipv6_flags() & IPV6_ADDRESS_FLAG_DEPRECATED) {
     return true;
   }
 
   return false;
 }
+#endif  // !defined(__native_client__)
 
 }  // namespace
 
 // These addresses are used as the targets to find out the default local address
 // on a multi-homed endpoint. They are actually DNS servers.
 const char kPublicIPv4Host[] = "8.8.8.8";
 const char kPublicIPv6Host[] = "2001:4860:4860::8888";
 const int kPublicPort = 53;  // DNS port.
 
 std::string MakeNetworkKey(const std::string& name, const IPAddress& prefix,
@@ skipping 754 matching lines @@
   std::stringstream ss;
   // Print out the first space-terminated token of the network desc, plus
   // the IP address.
   ss << "Net[" << description_.substr(0, description_.find(' '))
      << ":" << prefix_.ToSensitiveString() << "/" << prefix_length_
      << ":" << AdapterTypeToString(type_) << "]";
   return ss.str();
 }
 
 }  // namespace rtc