Revert "Move global sync settings to AccountSettings."

This reverts commit 64fde6f4e9.

Change-Id: I61940b6e2936c7c7f048af222602226e5588c268

src/com/android/settings/DataUsageSummary.java

@@ -489,7 +489,6 @@ public class DataUsageSummary extends HighlightingFragment implements Indexable
                 hasReadyMobileRadio(context) && isOwner && !appDetailMode);
         mMenuRestrictBackground.setChecked(mPolicyManager.getRestrictBackground());
 
-        // TODO: Define behavior of this sync button. See: http://b/16076571
         mMenuAutoSync = menu.findItem(R.id.data_usage_menu_auto_sync);
         mMenuAutoSync.setChecked(ContentResolver.getMasterSyncAutomatically());
         mMenuAutoSync.setVisible(!appDetailMode);