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

net/tools/quic/test_tools/mock_epoll_server.h

Index: net/tools/quic/test_tools/mock_epoll_server.h
diff --git a/net/tools/quic/test_tools/mock_epoll_server.h b/net/tools/quic/test_tools/mock_epoll_server.h
index 9eac59403bcd3df1c08844886cbc0a705fb4c260..f56f4ab19538c31894ee9f2724a9e0f7ab515a66 100644
--- a/net/tools/quic/test_tools/mock_epoll_server.h
+++ b/net/tools/quic/test_tools/mock_epoll_server.h
@@ -7,9 +7,6 @@
 
 #include <stddef.h>
 #include <stdint.h>
-
-#include <unordered_map>
-#include <unordered_set>
 
 #include "base/logging.h"
 #include "base/macros.h"
@@ -55,7 +52,7 @@
 
 class MockEpollServer : public FakeTimeEpollServer {
  public:  // type definitions
-  using EventQueue = std::unordered_multimap<int64_t, struct epoll_event>;
+  typedef base::hash_multimap<int64_t, struct epoll_event> EventQueue;
 
   MockEpollServer();
   ~MockEpollServer() override;
@@ -84,7 +81,7 @@
     WaitForEventsAndExecuteCallbacks();
   }
 
-  std::unordered_set<AlarmCB*>::size_type NumberOfAlarms() const {
+  base::hash_set<AlarmCB*>::size_type NumberOfAlarms() const {
     return all_alarms_.size();
   }