Switch to standard integer types in chrome/browser/, part 2 of 4.

chrome/browser/media_galleries/media_file_system_registry.cc

Index: chrome/browser/media_galleries/media_file_system_registry.cc
diff --git a/chrome/browser/media_galleries/media_file_system_registry.cc b/chrome/browser/media_galleries/media_file_system_registry.cc
index f16b9acce71810b2243753608e7faa45026867db..7907ddd0958a44eb07515e78f41d5b774b9df336 100644
--- a/chrome/browser/media_galleries/media_file_system_registry.cc
+++ b/chrome/browser/media_galleries/media_file_system_registry.cc
@@ -4,12 +4,15 @@
 
 #include "chrome/browser/media_galleries/media_file_system_registry.h"
 
+#include <stddef.h>
+
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_path.h"
+#include "base/macros.h"
 #include "base/prefs/pref_service.h"
 #include "base/stl_util.h"
 #include "chrome/browser/media_galleries/fileapi/media_file_system_backend.h"