Change userid from a uint32_t to a string guid

components/mus/ws/display_unittest.cc

Index: components/mus/ws/display_unittest.cc
diff --git a/components/mus/ws/display_unittest.cc b/components/mus/ws/display_unittest.cc
index ef8301666b2d3372926ec8b5b8c8de3650e2caae..663e04c135526d096516d20f9fb60db6709bb325 100644
--- a/components/mus/ws/display_unittest.cc
+++ b/components/mus/ws/display_unittest.cc
@@ -78,8 +78,8 @@ TEST_F(DisplayTest, CallsCreateDefaultDisplays) {
   const int kNumHostsToCreate = 2;
   connection_manager_delegate_.set_num_displays_to_create(kNumHostsToCreate);
 
-  const UserId kTestId1 = 2;
-  const UserId kTestId2 = 21;
+  const UserId kTestId1 = "2";
+  const UserId kTestId2 = "21";
   WindowManagerFactoryRegistryTestApi(
       connection_manager_->window_manager_factory_registry())
       .AddService(kTestId1, &test_window_manager_factory_);
@@ -116,8 +116,8 @@ TEST_F(DisplayTest, CallsCreateDefaultDisplays) {
 TEST_F(DisplayTest, Destruction) {
   connection_manager_delegate_.set_num_displays_to_create(1);
 
-  const UserId kTestId1 = 2;
-  const UserId kTestId2 = 21;
+  const UserId kTestId1 = "2";
+  const UserId kTestId2 = "21";
   WindowManagerFactoryRegistryTestApi(
       connection_manager_->window_manager_factory_registry())
       .AddService(kTestId1, &test_window_manager_factory_);