Change userid from a uint32_t to a string guid

components/font_service/font_service_app.cc

Index: components/font_service/font_service_app.cc
diff --git a/components/font_service/font_service_app.cc b/components/font_service/font_service_app.cc
index d599b0925ec661ab0bc720e64ce7ba424c9c4b5f..d0c0c1c5d167c9956f3d27c2ca69b6ddeba62deb 100644
--- a/components/font_service/font_service_app.cc
+++ b/components/font_service/font_service_app.cc
@@ -60,7 +60,7 @@ FontServiceApp::~FontServiceApp() {}
 
 void FontServiceApp::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);
 }