Revert "Fixed random SlaveRecoveryTest.PingTimeoutDuringRecovery test failure."

This reverts commit 57088b11a328355b7f2a53a1b3fba9928a2fde73.
diff --git a/src/tests/slave_recovery_tests.cpp b/src/tests/slave_recovery_tests.cpp
index 41ecd3b..3980114 100644
--- a/src/tests/slave_recovery_tests.cpp
+++ b/src/tests/slave_recovery_tests.cpp
@@ -1010,15 +1010,6 @@
 
   slave.get()->terminate();
 
-  // Make sure that timers started by the previous slave's process expire,
-  // because we reuse the same PID we don't want them to fire while the
-  // new process is running.
-  Clock::pause();
-  Clock::advance(masterFlags.agent_ping_timeout *
-    masterFlags.max_agent_ping_timeouts);
-  Clock::settle();
-  Clock::resume();
-
   Future<ReregisterExecutorMessage> reregisterExecutor =
     FUTURE_PROTOBUF(ReregisterExecutorMessage(), _, _);