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

chromecast/net/net_util_cast.cc

 // Copyright 2015 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 "chromecast/net/net_util_cast.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_split.h"
 #include "chromecast/base/cast_sys_info_util.h"
 #include "chromecast/net/net_switches.h"
 #include "chromecast/public/cast_sys_info.h"
 
 namespace chromecast {
 
-std::unordered_set<std::string> GetIgnoredInterfaces() {
-  std::unordered_set<std::string> ignored_interfaces;
+base::hash_set<std::string> GetIgnoredInterfaces() {
+  base::hash_set<std::string> ignored_interfaces;
   std::unique_ptr<CastSysInfo> sys_info = CreateSysInfo();
   if (!sys_info->GetApInterface().empty())
     ignored_interfaces.insert(sys_info->GetApInterface());
 
   // Add interfaces from "netif-to-ignore" switch.
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   base::CommandLine::StringType netifs_to_ignore_str =
       command_line->GetSwitchValueNative(switches::kNetifsToIgnore);
   for (const std::string& netif : base::SplitString(
            netifs_to_ignore_str, ",", base::TRIM_WHITESPACE,
            base::SPLIT_WANT_ALL))
     ignored_interfaces.insert(netif);
 
   return ignored_interfaces;
 }
 
 }  // namespace chromecast