Check if removed account is primary in child account service

If child user has secondary accounts, the IsChild profile property will
be set to false after removal of any account. Fix this by checking if
the removed account is a primary account in
OnExtendedAccountInfoRemoved method.

Bug: 1043108
Change-Id: Ia9038932bb3baff8ae69a46675b5a995e3294826
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015161Reviewed-by: Aga Wronska <agawronska@chromium.org>
Reviewed-by: Kush Sinha <sinhak@chromium.org>
Commit-Queue: Anastasiia Nikolaienko <anastasiian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734514}

chrome/browser/supervised_user/child_accounts/child_account_service.cc

@@ -267,6 +267,9 @@ void ChildAccountService::OnExtendedAccountInfoUpdated(
 
 void ChildAccountService::OnExtendedAccountInfoRemoved(
     const AccountInfo& info) {
+  if (info.account_id != identity_manager_->GetPrimaryAccountId())
+    return;
+
   SetIsChildAccount(false);
 }