Switch to standard integer types in extensions/browser/.

extensions/browser/api/system_storage/system_storage_apitest.cc

Index: extensions/browser/api/system_storage/system_storage_apitest.cc
diff --git a/extensions/browser/api/system_storage/system_storage_apitest.cc b/extensions/browser/api/system_storage/system_storage_apitest.cc
index af7262f30de40206c5d32993557f7519d1832aee..92af67865876c0dc3d0f804a2f00addf910564bf 100644
--- a/extensions/browser/api/system_storage/system_storage_apitest.cc
+++ b/extensions/browser/api/system_storage/system_storage_apitest.cc
@@ -2,8 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <stddef.h>
+
 #include <vector>
 
+#include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/storage_monitor/storage_monitor.h"