Convert IdletimerController to iptables-restore.

Bug: 28362720
Test: bullhead builds,boots
Test: netd_{unit,integration}_test pass
Change-Id: I435346a25a25df23e72dbc5be4ead0782e36c78d
diff --git a/server/IdletimerController.h b/server/IdletimerController.h
index 33abdb6..87e0b4e 100644
--- a/server/IdletimerController.h
+++ b/server/IdletimerController.h
@@ -18,6 +18,8 @@
 
 #include <stdint.h>
 
+#include "NetdConstants.h"
+
 class IdletimerController {
 public:
 
@@ -43,7 +45,7 @@
                                  const char *classLabel);
 
     friend class IdletimerControllerTest;
-    static int (*execFunction)(int, char **, int *, bool, bool);
+    static int (*execIptablesRestore)(IptablesTarget, const std::string&);
 };
 
 #endif