Revert "init: Fix a race condition in KillProcessGroup()"

This reverts commit d8ef6f84d4df1b0cb9aab942ea221020bde61c6a.

Reason for revert: b/256874349

Change-Id: I86a1e03a0d2979db1c54abd3e78c32591fda98a1
diff --git a/init/service.h b/init/service.h
index 10a0790..b2c9909 100644
--- a/init/service.h
+++ b/init/service.h
@@ -155,8 +155,7 @@
     void ResetFlagsForStart();
     Result<void> CheckConsole();
     void ConfigureMemcg();
-    void RunService(const std::vector<Descriptor>& descriptors, InterprocessFifo cgroups_activated,
-                    InterprocessFifo setsid_finished);
+    void RunService(const std::vector<Descriptor>& descriptors, InterprocessFifo cgroups_activated);
     void SetMountNamespace();
     static unsigned long next_start_order_;
     static bool is_exec_service_running_;