Make AtomicFile a public API.  It's about time!

Change-Id: Ib34e294747405b7ab709cb0bbb2d9a0cc80ce86a
diff --git a/services/java/com/android/server/NotificationManagerService.java b/services/java/com/android/server/NotificationManagerService.java
index f6d3b608..9ab1a9d 100755
--- a/services/java/com/android/server/NotificationManagerService.java
+++ b/services/java/com/android/server/NotificationManagerService.java
@@ -53,6 +53,7 @@
 import android.provider.Settings;
 import android.telephony.TelephonyManager;
 import android.text.TextUtils;
+import android.util.AtomicFile;
 import android.util.EventLog;
 import android.util.Log;
 import android.util.Slog;
@@ -61,7 +62,6 @@
 import android.view.accessibility.AccessibilityManager;
 import android.widget.Toast;
 
-import com.android.internal.os.AtomicFile;
 import com.android.internal.statusbar.StatusBarNotification;
 import com.android.internal.util.FastXmlSerializer;