Fix build

Author: shana

src/GitHub.Api/ApplicationManagerBase.cs

@@ -11,7 +11,6 @@ abstract class ApplicationManagerBase : IApplicationManager
         protected static ILogging Logger { get; } = Logging.GetLogger<IApplicationManager>();
 
         private IEnvironment environment;
-        private AppConfiguration appConfiguration;
         private RepositoryManager repositoryManager;
 
         public ApplicationManagerBase(SynchronizationContext synchronizationContext)
@@ -190,14 +189,6 @@ public void Dispose()
             Dispose(true);
         }
 
-        public AppConfiguration AppConfiguration
-        {
-            get
-            {
-                return appConfiguration ?? (appConfiguration = new AppConfiguration());
-            }
-        }
-
         public IEnvironment Environment
         {
             get