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

Change-Id: Ib34e294747405b7ab709cb0bbb2d9a0cc80ce86a
diff --git a/services/java/com/android/server/AppWidgetServiceImpl.java b/services/java/com/android/server/AppWidgetServiceImpl.java
index 8836bac..46b968a 100644
--- a/services/java/com/android/server/AppWidgetServiceImpl.java
+++ b/services/java/com/android/server/AppWidgetServiceImpl.java
@@ -44,6 +44,7 @@
 import android.os.RemoteException;
 import android.os.SystemClock;
 import android.os.UserId;
+import android.util.AtomicFile;
 import android.util.AttributeSet;
 import android.util.Log;
 import android.util.Pair;
@@ -55,7 +56,6 @@
 import android.widget.RemoteViews;
 
 import com.android.internal.appwidget.IAppWidgetHost;
-import com.android.internal.os.AtomicFile;
 import com.android.internal.util.FastXmlSerializer;
 import com.android.internal.widget.IRemoteViewsAdapterConnection;
 import com.android.internal.widget.IRemoteViewsFactory;