Change userid from a uint32_t to a string guid

media/mojo/services/mojo_media_application.cc

Index: media/mojo/services/mojo_media_application.cc
diff --git a/media/mojo/services/mojo_media_application.cc b/media/mojo/services/mojo_media_application.cc
index 0def56ad3360c74576941b6c35ab82ef61cd8713..380d95f080633fd7039e528e17d999f6484b8cd2 100644
--- a/media/mojo/services/mojo_media_application.cc
+++ b/media/mojo/services/mojo_media_application.cc
@@ -27,8 +27,8 @@ MojoMediaApplication::~MojoMediaApplication() {}
 
 void MojoMediaApplication::Initialize(mojo::Connector* connector,
                                       const std::string& /* url */,
-                                      uint32_t /* id */,
-                                      uint32_t user_id) {
+                                      const std::string& user_id,
+                                      uint32_t /* id */) {
   connector_ = connector;
   mojo_media_client_->Initialize();
 }