[net] Add WifiPhyMode to SystemProfile

net/base/net_util_posix.cc

 // Copyright (c) 2011 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/base/net_util.h"
 
 #include <sys/types.h>
 
 #include "base/file_path.h"
 #include "base/logging.h"
@@ skipping 123 matching lines @@
       networks->push_back(NetworkInterface(name, address.address()));
     }
   }
 
   freeifaddrs(interfaces);
 
   return true;
 #endif
 }
 
+WifiPhyMode GetWifiPhyMode() {
+  return WIFI_PHY_MODE_UNKNOWN;
+}
+
 }  // namespace net