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

net/base/network_change_notifier_linux.h

Index: net/base/network_change_notifier_linux.h
diff --git a/net/base/network_change_notifier_linux.h b/net/base/network_change_notifier_linux.h
index f497b159170a675b19088616caa1caa016fbbeaa..3439270bcd192f8a270aa2593481a181e1052f00 100644
--- a/net/base/network_change_notifier_linux.h
+++ b/net/base/network_change_notifier_linux.h
@@ -6,9 +6,9 @@
 #define NET_BASE_NETWORK_CHANGE_NOTIFIER_LINUX_H_
 
 #include <memory>
+#include <unordered_set>
 
 #include "base/compiler_specific.h"
-#include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "net/base/net_export.h"
 #include "net/base/network_change_notifier.h"
@@ -25,7 +25,7 @@ class NET_EXPORT_PRIVATE NetworkChangeNotifierLinux
   // interfaces used to connect to the internet can cause critical network
   // changed signals to be lost allowing incorrect stale state to persist.
   explicit NetworkChangeNotifierLinux(
-      const base::hash_set<std::string>& ignored_interfaces);
+      const std::unordered_set<std::string>& ignored_interfaces);
 
  private:
   class Thread;