diff --git a/atom/browser/net/system_network_context_manager.cc b/atom/browser/net/system_network_context_manager.cc
index f9d1a1267932..eac424117fcc 100644
--- a/atom/browser/net/system_network_context_manager.cc
+++ b/atom/browser/net/system_network_context_manager.cc
@@ -249,9 +249,6 @@ SystemNetworkContextManager::CreateNetworkContextParams() {
 
   network_context_params->http_cache_enabled = false;
 
-  // These are needed for PAC scripts that use file or data URLs (Or FTP URLs?).
-  // TODO(crbug.com/839566): remove file support for all cases.
-  network_context_params->enable_data_url_support = true;
   if (!base::FeatureList::IsEnabled(network::features::kNetworkService))
     network_context_params->enable_file_url_support = true;
 #if !BUILDFLAG(DISABLE_FTP_SUPPORT)