Moved WifiWatchdogService and DnsPinger

- Moved WWS and DnsPinger in prep for StateMachine rewrite
 intent.

Change-Id: I912ca80d31ee2ded99eb345a2e5a55d01bd9910c
diff --git a/services/java/com/android/server/WifiService.java b/services/java/com/android/server/WifiService.java
index 7725891..5f0922e 100644
--- a/services/java/com/android/server/WifiService.java
+++ b/services/java/com/android/server/WifiService.java
@@ -36,6 +36,7 @@
 import android.net.wifi.WifiStateMachine;
 import android.net.wifi.WifiConfiguration;
 import android.net.wifi.WifiConfiguration.KeyMgmt;
+import android.net.wifi.WifiWatchdogService;
 import android.net.wifi.WpsConfiguration;
 import android.net.wifi.WpsResult;
 import android.net.ConnectivityManager;