Reland 'Convert //net and //chromecast to std::unordered_*'

chromecast/net/net_util_cast.cc

Index: chromecast/net/net_util_cast.cc
diff --git a/chromecast/net/net_util_cast.cc b/chromecast/net/net_util_cast.cc
index e99731cb4e430e7fdc5fed3bf4ae2246b4a87913..5eebe7756933647ba18a423f18e520bf2bcc5de9 100644
--- a/chromecast/net/net_util_cast.cc
+++ b/chromecast/net/net_util_cast.cc
@@ -12,8 +12,8 @@
 
 namespace chromecast {
 
-base::hash_set<std::string> GetIgnoredInterfaces() {
-  base::hash_set<std::string> ignored_interfaces;
+std::unordered_set<std::string> GetIgnoredInterfaces() {
+  std::unordered_set<std::string> ignored_interfaces;
   std::unique_ptr<CastSysInfo> sys_info = CreateSysInfo();
   if (!sys_info->GetApInterface().empty())
     ignored_interfaces.insert(sys_info->GetApInterface());