Watch out for deleted user when exiting async task

Fixes a problem where the async task can take a while to execute
and in the meantime the user can be removed. On exiting the async
task and updating the UI, make sure the user hasn't been deleted.

Bug: 18411181
Change-Id: I1831f3e53084c49e27557cb7aacec78c753a611b

src/com/android/settings/users/RestrictedProfileSettings.java

@@ -87,7 +87,7 @@ public class RestrictedProfileSettings extends AppRestrictionsFragment
         super.onResume();
 
         // Check if user still exists
-        UserInfo info = getExistingUser(mUser);
+        UserInfo info = Utils.getExistingUser(mUserManager, mUser);
         if (info == null) {
             finishFragment();
         } else {
@@ -97,16 +97,6 @@ public class RestrictedProfileSettings extends AppRestrictionsFragment
         }
     }
 
-    private UserInfo getExistingUser(UserHandle thisUser) {
-        final List<UserInfo> users = mUserManager.getUsers(true); // Only get non-dying
-        for (UserInfo user : users) {
-            if (user.id == thisUser.getIdentifier()) {
-                return user;
-            }
-        }
-        return null;
-    }
-
     @Override
     public void startActivityForResult(Intent intent, int requestCode) {
         mEditUserInfoController.startingActivityForResult();