Added RestartAsync to IRuntime instead of cancellation token

src/Umbraco.Core/Services/IRuntime.cs

@@ -1,4 +1,5 @@
 using System.Threading;
+using System.Threading.Tasks;
 using Microsoft.Extensions.Hosting;
 
 namespace Umbraco.Cms.Core.Services
@@ -13,6 +14,6 @@ namespace Umbraco.Cms.Core.Services
         /// </summary>
         IRuntimeState State { get; }
 
-        CancellationToken CancellationToken { get; }
+        Task RestartAsync();
     }
 }

src/Umbraco.Infrastructure/Runtime/CoreRuntime.cs

@@ -31,6 +31,7 @@ namespace Umbraco.Cms.Infrastructure.Runtime
         private readonly IHostingEnvironment _hostingEnvironment;
         private readonly DatabaseBuilder _databaseBuilder;
         private readonly IUmbracoVersion _umbracoVersion;
+        private CancellationToken _cancellationToken;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="CoreRuntime"/> class.
@@ -66,12 +67,16 @@ namespace Umbraco.Cms.Infrastructure.Runtime
         /// Gets the state of the Umbraco runtime.
         /// </summary>
         public IRuntimeState State { get; }
-        public CancellationToken CancellationToken { get; private set; }
+        public async Task RestartAsync()
+        {
+            await StopAsync(_cancellationToken);
+            await StartAsync(_cancellationToken);
+        }
 
         /// <inheritdoc/>
         public async Task StartAsync(CancellationToken cancellationToken)
         {
-            CancellationToken = cancellationToken;
+            _cancellationToken = cancellationToken;
             StaticApplicationLogging.Initialize(_loggerFactory);
 
             AppDomain.CurrentDomain.UnhandledException += (_, args) =>

src/Umbraco.Web.BackOffice/Install/InstallApiController.cs

@@ -100,8 +100,7 @@ namespace Umbraco.Cms.Web.BackOffice.Install
         public async Task<ActionResult> CompleteInstall()
         {
 
-            await _runtime.StopAsync(_runtime.CancellationToken);
-            await _runtime.StartAsync(_runtime.CancellationToken);
+            await _runtime.RestartAsync();
 
             var identityUser = await _backOfficeUserManager.FindByIdAsync(Core.Constants.Security.SuperUserIdAsString);
             _backOfficeSignInManager.SignInAsync(identityUser, false);