Remove remaining legacy SplitString calls.

components/signin/core/browser/child_account_info_fetcher_impl.cc

Index: components/signin/core/browser/child_account_info_fetcher_impl.cc
diff --git a/components/signin/core/browser/child_account_info_fetcher_impl.cc b/components/signin/core/browser/child_account_info_fetcher_impl.cc
index d897ca0c4a21bede091bb06c971d0738214a3c01..085c2b007c380038f0e1b7c428a146a8b088edb2 100644
--- a/components/signin/core/browser/child_account_info_fetcher_impl.cc
+++ b/components/signin/core/browser/child_account_info_fetcher_impl.cc
@@ -122,8 +122,9 @@ void ChildAccountInfoFetcherImpl::OnGetUserInfoSuccess(
     const UserInfoMap& data) {
   UserInfoMap::const_iterator services_iter = data.find("allServices");
   if (services_iter != data.end()) {
-    std::vector<std::string> service_flags;
-    base::SplitString(services_iter->second, ',', &service_flags);
+    std::vector<std::string> service_flags = base::SplitString(
+        services_iter->second, ",", base::TRIM_WHITESPACE,
+        base::SPLIT_WANT_ALL);
     bool is_child_account =
         std::find(service_flags.begin(), service_flags.end(),
                   AccountTrackerService::kChildAccountServiceFlag) !=