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

net/base/network_change_notifier.cc

Index: net/base/network_change_notifier.cc
diff --git a/net/base/network_change_notifier.cc b/net/base/network_change_notifier.cc
index 93ca8ba24909b0ea2618344025748b399b5b372d..0cfaaa38d259db9be27343bf487aaf3b88d1a6a0 100644
--- a/net/base/network_change_notifier.cc
+++ b/net/base/network_change_notifier.cc
@@ -5,6 +5,7 @@
 #include "net/base/network_change_notifier.h"
 
 #include <limits>
+#include <unordered_set>
 
 #include "base/macros.h"
 #include "base/metrics/histogram_macros.h"
@@ -528,7 +529,7 @@ NetworkChangeNotifier* NetworkChangeNotifier::Create() {
 #endif
   return NULL;
 #elif defined(OS_LINUX)
-  return new NetworkChangeNotifierLinux(base::hash_set<std::string>());
+  return new NetworkChangeNotifierLinux(std::unordered_set<std::string>());
 #elif defined(OS_MACOSX)
   return new NetworkChangeNotifierMac();
 #else