Change userid from a uint32_t to a string guid

components/filesystem/file_system_app.cc

Index: components/filesystem/file_system_app.cc
diff --git a/components/filesystem/file_system_app.cc b/components/filesystem/file_system_app.cc
index 8bb5354d12470bd5b9f583004acd4cd369349fa2..e4620ba8126d0c4ad9260c38977aeca1a722d532 100644
--- a/components/filesystem/file_system_app.cc
+++ b/components/filesystem/file_system_app.cc
@@ -39,7 +39,8 @@ FileSystemApp::~FileSystemApp() {}
 
 void FileSystemApp::Initialize(mojo::Connector* connector,
                                const std::string& url,
-                               uint32_t id, uint32_t user_id) {
+                               const std::string& user_id,
+                               uint32_t id) {
   tracing_.Initialize(connector, url);
 }