clean up backup imports

Change-Id: Ic78e071eabb9931b2aaec34b57ab187bf3a1cfd6
diff --git a/src/com/android/launcher3/LauncherBackupHelper.java b/src/com/android/launcher3/LauncherBackupHelper.java
index 9b901ee..8023fcd 100644
--- a/src/com/android/launcher3/LauncherBackupHelper.java
+++ b/src/com/android/launcher3/LauncherBackupHelper.java
@@ -31,9 +31,8 @@
 import com.android.launcher3.backup.BackupProtos.Widget;
 
 import android.app.backup.BackupDataInputStream;
-import android.app.backup.BackupHelper;
-import android.app.backup.BackupDataInput;
 import android.app.backup.BackupDataOutput;
+import android.app.backup.BackupHelper;
 import android.app.backup.BackupManager;
 import android.appwidget.AppWidgetManager;
 import android.appwidget.AppWidgetProviderInfo;