Update to newer Android Lint and suppress new Lint errors

tools/android/kerberos/SpnegoAuthenticator/src/org/chromium/tools/spnegoauthenticator/SpnegoAuthenticatorService.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.tools.spnegoauthenticator;
 
+import android.annotation.SuppressLint;
 import android.app.Service;
 import android.content.Intent;
 import android.os.IBinder;
 
 import org.chromium.base.Log;
 
 /** Service exposing the dummy {@link SpnegoAuthenticator}. */
 public class SpnegoAuthenticatorService extends Service {
     private static final String TAG = "tools_SpnegoAuth";
+    @SuppressLint("StaticFieldLeak")
     private static SpnegoAuthenticator sAuthenticator;
 
     @Override
     public IBinder onBind(Intent intent) {
         Log.d(TAG, "Binding SpnegoAuthenticatorService");
         if (sAuthenticator == null) sAuthenticator = new SpnegoAuthenticator(this);
         return sAuthenticator.getIBinder();
     }
 }