Revert of Disable fetching account flags for signed in users.

chrome/browser/supervised_user/child_accounts/child_account_service.cc

Index: chrome/browser/supervised_user/child_accounts/child_account_service.cc
diff --git a/chrome/browser/supervised_user/child_accounts/child_account_service.cc b/chrome/browser/supervised_user/child_accounts/child_account_service.cc
index 1e906124a4b7ba4cd6950fc33d535a2f32049a8e..25eb5ce9e906367e9d6c354caafe7c16257112d4 100644
--- a/chrome/browser/supervised_user/child_accounts/child_account_service.cc
+++ b/chrome/browser/supervised_user/child_accounts/child_account_service.cc
@@ -261,6 +261,12 @@
 void ChildAccountService::StartFetchingServiceFlags() {
   account_id_ = SigninManagerFactory::GetForProfile(profile_)
       ->GetAuthenticatedAccountId();
+  flag_fetcher_.reset(new AccountServiceFlagFetcher(
+      account_id_,
+      ProfileOAuth2TokenServiceFactory::GetForProfile(profile_),
+      profile_->GetRequestContext(),
+      base::Bind(&ChildAccountService::OnFlagsFetched,
+                 weak_ptr_factory_.GetWeakPtr())));
 }
 
 void ChildAccountService::CancelFetchingServiceFlags() {