Send traffic-management headers from extension updater.

chrome/browser/extensions/api/developer_private/developer_private_api.cc

Index: chrome/browser/extensions/api/developer_private/developer_private_api.cc
diff --git a/chrome/browser/extensions/api/developer_private/developer_private_api.cc b/chrome/browser/extensions/api/developer_private/developer_private_api.cc
index 1350a41117cf9ff85b10b70912f1476d7983f086..f2b455a41118817bc33a49a150372e93107a9182 100644
--- a/chrome/browser/extensions/api/developer_private/developer_private_api.cc
+++ b/chrome/browser/extensions/api/developer_private/developer_private_api.cc
@@ -527,6 +527,7 @@ ExtensionFunction::ResponseAction DeveloperPrivateAutoUpdateFunction::Run() {
       ExtensionSystem::Get(browser_context())->extension_service()->updater();
   if (updater) {
     ExtensionUpdater::CheckParams params;
+    params.fetch_priority = ManifestFetchData::FetchPriority::FOREGROUND;
     params.install_immediately = true;
     updater->CheckNow(params);
   }