Refresh authenticator info when accounts change.

There may be newly installed authenticators, so refresh them when
accounts change.

Bug: 7280043
Change-Id: Ic173970c815950526c77a2653e7fae4551948f13

src/com/android/settings/Settings.java

@@ -750,6 +750,8 @@ public class Settings extends PreferenceActivity
 
     @Override
     public void onAccountsUpdated(Account[] accounts) {
+        // TODO: watch for package upgrades to invalidate cache; see 7206643
+        mAuthenticatorHelper.updateAuthDescriptions(this);
         mAuthenticatorHelper.onAccountsUpdated(this, accounts);
         invalidateHeaders();
     }