Add mojom module suffix in .mojom files for components/filesystem.

services/user/user_service.h

Index: services/user/user_service.h
diff --git a/services/user/user_service.h b/services/user/user_service.h
index 347d2f524642aa02132403da329e0081c706f539..2aeee76f5be08c5c019729db1c34d7d5a887dd62 100644
--- a/services/user/user_service.h
+++ b/services/user/user_service.h
@@ -26,10 +26,10 @@ class UserService : public mojom::UserService {
   ~UserService() override;
 
   // Overridden from mojom::UserService:
-  void GetDirectory(filesystem::DirectoryRequest request,
+  void GetDirectory(filesystem::mojom::DirectoryRequest request,
                     const GetDirectoryCallback& callback) override;
   void GetSubDirectory(const mojo::String& sub_directory_path,
-                       filesystem::DirectoryRequest request,
+                       filesystem::mojom::DirectoryRequest request,
                        const GetSubDirectoryCallback& callback) override;
 
  private: