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

net/tools/epoll_server/epoll_server.h

Index: net/tools/epoll_server/epoll_server.h
diff --git a/net/tools/epoll_server/epoll_server.h b/net/tools/epoll_server/epoll_server.h
index a913eba2dc07399b1001cdea5be07c0ae2a0dbdc..460db3d3a4aa9ee71e8a9337463e20122d034b56 100644
--- a/net/tools/epoll_server/epoll_server.h
+++ b/net/tools/epoll_server/epoll_server.h
@@ -12,8 +12,6 @@
 
 #include <map>
 #include <string>
-#include <unordered_map>
-#include <unordered_set>
 #include <vector>
 
 // #define EPOLL_SERVER_EVENT_TRACING 1
@@ -36,6 +34,7 @@
 #endif
 
 #include "base/compiler_specific.h"
+#include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include <sys/epoll.h>
@@ -554,7 +553,7 @@
     }
   };
 
-  using FDToCBMap = std::unordered_set<CBAndEventMask, CBAndEventMaskHash>;
+  typedef base::hash_set<CBAndEventMask, CBAndEventMaskHash> FDToCBMap;
 
   // the following four functions are OS-specific, and are likely
   // to be changed in a subclass if the poll/select method is changed
@@ -665,7 +664,7 @@
   // only so that we can enforce stringent checks that a caller can not register
   // the same alarm twice. One option is to have an implementation in which
   // this hash_set is used only in the debug mode.
-  using AlarmCBMap = std::unordered_set<AlarmCB*, AlarmCBHash>;
+  typedef base::hash_set<AlarmCB*, AlarmCBHash> AlarmCBMap;
   AlarmCBMap all_alarms_;
 
   TimeToAlarmCBMap alarm_map_;
@@ -916,7 +915,7 @@
 
     std::vector<DebugOutput*> debug_events_;
     std::vector<Events> unregistered_fds_;
-    using EventCountsMap = std::unordered_map<int, Events>;
+    typedef base::hash_map<int, Events> EventCountsMap;
     EventCountsMap event_counts_;
     int64_t num_records_;
     int64_t record_threshold_;