Remove obsolete IMenuProvider

Author: jcansdale

src/GitHub.VisualStudio/GitHubPackage.cs

@@ -114,9 +114,6 @@ public ServiceProviderExports([Import(typeof(SVsServiceProvider))] IServiceProvi
         [ExportForProcess(typeof(ILoginManager), ProcessName)]
         public ILoginManager LoginManager => GetService<ILoginManager>();
 
-        [ExportForProcess(typeof(IMenuProvider), ProcessName)]
-        public IMenuProvider MenuProvider => GetService<IMenuProvider>();
-
         [ExportForProcess(typeof(IGitHubServiceProvider), ProcessName)]
         public IGitHubServiceProvider GitHubServiceProvider => GetService<IGitHubServiceProvider>();