Revert of Convert //net and //chromecast to std::unordered_*

net/base/network_interfaces_linux.cc

 // Copyright (c) 2014 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/network_interfaces_linux.h"
 
 #if !defined(OS_ANDROID)
 #include <linux/ethtool.h>
 #endif  // !defined(OS_ANDROID)
 #include <linux/if.h>
@@ skipping 95 matching lines @@
   wreq.u.essid.pointer = ssid;
   wreq.u.essid.length = IW_ESSID_MAX_SIZE;
   if (ioctl(ioctl_socket.get(), SIOCGIWESSID, &wreq) != -1)
     return ssid;
   return "";
 }
 
 bool GetNetworkListImpl(
     NetworkInterfaceList* networks,
     int policy,
-    const std::unordered_set<int>& online_links,
+    const base::hash_set<int>& online_links,
     const internal::AddressTrackerLinux::AddressMap& address_map,
     GetInterfaceNameFunction get_interface_name) {
   std::map<int, std::string> ifnames;
 
   for (internal::AddressTrackerLinux::AddressMap::const_iterator it =
            address_map.begin();
        it != address_map.end(); ++it) {
     // Ignore addresses whose links are not online.
     if (online_links.find(it->second.ifa_index) == online_links.end())
       continue;
@@ skipping 86 matching lines @@
 std::string GetWifiSSID() {
   NetworkInterfaceList networks;
   if (GetNetworkList(&networks, INCLUDE_HOST_SCOPE_VIRTUAL_INTERFACES)) {
     return internal::GetWifiSSIDFromInterfaceListInternal(
         networks, internal::GetInterfaceSSID);
   }
   return "";
 }
 
 }  // namespace net