Remove the unused Looper param from Tethering constructor.

Tethering just constructs its own Looper right below where it
assigns the looper param to mLooper.

Change-Id: I2d522942eff2ad3439bb3961e78ab0625d3fa9df

services/core/java/com/android/server/ConnectivityService.java

@@ -745,7 +745,7 @@ public class ConnectivityService extends IConnectivityManager.Stub
         mTestMode = SystemProperties.get("cm.test.mode").equals("true")
                 && SystemProperties.get("ro.build.type").equals("eng");
 
-        mTethering = new Tethering(mContext, mNetd, statsService, mHandler.getLooper());
+        mTethering = new Tethering(mContext, mNetd, statsService);
 
         mPermissionMonitor = new PermissionMonitor(mContext, mNetd);