Add service name constant for UI service.

chrome/browser/ui/views/chrome_browser_main_extra_parts_views.cc

Index: chrome/browser/ui/views/chrome_browser_main_extra_parts_views.cc
diff --git a/chrome/browser/ui/views/chrome_browser_main_extra_parts_views.cc b/chrome/browser/ui/views/chrome_browser_main_extra_parts_views.cc
index 43f6657065609622faf335fb51ef378800a7d5f7..1454f75467b48214126710bf5933aa4d2d35f2f4 100644
--- a/chrome/browser/ui/views/chrome_browser_main_extra_parts_views.cc
+++ b/chrome/browser/ui/views/chrome_browser_main_extra_parts_views.cc
@@ -16,6 +16,7 @@
 #include "services/service_manager/runner/common/client_util.h"
 #include "services/ui/public/cpp/gpu_service.h"
 #include "services/ui/public/cpp/input_devices/input_device_client.h"
+#include "services/ui/public/interfaces/constants.mojom.h"
 #include "services/ui/public/interfaces/input_devices/input_device_server.mojom.h"
 #include "ui/display/screen.h"
 #include "ui/views/mus/window_manager_connection.h"
@@ -101,7 +102,8 @@ void ChromeBrowserMainExtraPartsViews::ServiceManagerConnectionStarted(
 
     input_device_client_.reset(new ui::InputDeviceClient());
     ui::mojom::InputDeviceServerPtr server;
-    connection->GetConnector()->ConnectToInterface("ui", &server);
+    connection->GetConnector()->ConnectToInterface(ui::mojom::kServiceName,
+                                                   &server);
     input_device_client_->Connect(std::move(server));
 
     window_manager_connection_ = views::WindowManagerConnection::Create(