Work on issue #3101415: Crespo apps seem to have their UID changed over time.

fsync!

Change-Id: Ie6c5397202579935ac69bf61d3e7b3081ecf269c
diff --git a/services/java/com/android/server/am/ActivityManagerService.java b/services/java/com/android/server/am/ActivityManagerService.java
index 9c06c33..7eb295b 100644
--- a/services/java/com/android/server/am/ActivityManagerService.java
+++ b/services/java/com/android/server/am/ActivityManagerService.java
@@ -6074,6 +6074,7 @@
             Slog.w(TAG, "Failure writing last done pre-boot receivers", e);
             file.delete();
         } finally {
+            FileUtils.sync(fos);
             if (dos != null) {
                 try {
                     dos.close();