Merge change Icabbe5fe into eclair-mr2

* changes:
  Fix #2159410 (side-effect of unexpected account deletion)

src/com/android/exchange/SyncManager.java

@@ -835,6 +835,7 @@ public class SyncManager extends Service implements Runnable {
             mSyncedMessageObserver = null;
             mMessageObserver = null;
             mSyncStatusObserver = null;
+            mAccountsUpdatedListener = null;
         }
     }