Fix lint issues with Chromoting for Android.

remoting/android/java/src/org/chromium/chromoting/Chromoting.java

Index: remoting/android/java/src/org/chromium/chromoting/Chromoting.java
diff --git a/remoting/android/java/src/org/chromium/chromoting/Chromoting.java b/remoting/android/java/src/org/chromium/chromoting/Chromoting.java
index f8a9849bfe9b09f8e688914a00c456552355173d..837a8b971483a1f26ed2372e772f77ecfafafe54 100644
--- a/remoting/android/java/src/org/chromium/chromoting/Chromoting.java
+++ b/remoting/android/java/src/org/chromium/chromoting/Chromoting.java
@@ -10,6 +10,7 @@ import android.accounts.AccountManagerCallback;
 import android.accounts.AccountManagerFuture;
 import android.accounts.AuthenticatorException;
 import android.accounts.OperationCanceledException;
+import android.annotation.TargetApi;
 import android.app.ActionBar;
 import android.app.Activity;
 import android.app.AlertDialog;
@@ -18,6 +19,7 @@ import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.res.Configuration;
+import android.os.Build;
 import android.os.Bundle;
 import android.provider.Settings;
 import android.util.Log;
@@ -98,6 +100,7 @@ public class Chromoting extends Activity implements JniInterface.ConnectionListe
         builder.setMessage(R.string.noaccounts_message);
         builder.setPositiveButton(R.string.noaccounts_add_account,
                 new DialogInterface.OnClickListener() {
+                    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
                     @Override
                     public void onClick(DialogInterface dialog, int id) {
                         Intent intent = new Intent(Settings.ACTION_ADD_ACCOUNT);