Fix a race condition in SyncManager.onAccountsUpdated()

Get the full list of accounts from AccountManagerService in one shot
instead of getting them per user.

Bug: 6263091

Change-Id: I488f24749a96281ef1e2a620820399c97f471024
diff --git a/core/java/android/content/SyncStorageEngine.java b/core/java/android/content/SyncStorageEngine.java
index 9c81c9e..d3baf70 100644
--- a/core/java/android/content/SyncStorageEngine.java
+++ b/core/java/android/content/SyncStorageEngine.java
@@ -25,7 +25,7 @@
 import org.xmlpull.v1.XmlSerializer;
 
 import android.accounts.Account;
-import android.content.SyncManager.AccountAndUser;
+import android.accounts.AccountAndUser;
 import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteException;