Remove usage of TaskCache

src/Microsoft.AspNetCore.Diagnostics/ExceptionHandler/ExceptionHandlerMiddleware.cs

@@ -6,7 +6,6 @@ using System.Diagnostics;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;
-using Microsoft.Extensions.Internal;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using Microsoft.Net.Http.Headers;
@@ -102,7 +101,7 @@ namespace Microsoft.AspNetCore.Diagnostics
             response.Headers[HeaderNames.Pragma] = "no-cache";
             response.Headers[HeaderNames.Expires] = "-1";
             response.Headers.Remove(HeaderNames.ETag);
-            return TaskCache.CompletedTask;
+            return Task.CompletedTask;
         }
     }
 }

src/Microsoft.AspNetCore.Diagnostics/Microsoft.AspNetCore.Diagnostics.csproj

@@ -27,7 +27,6 @@
     <PackageReference Include="Microsoft.Extensions.Options" Version="$(AspNetCoreVersion)" />
     <PackageReference Include="Microsoft.Extensions.RazorViews.Sources" Version="$(AspNetCoreVersion)" PrivateAssets="All"/>
     <PackageReference Include="Microsoft.Extensions.StackTrace.Sources" Version="$(AspNetCoreVersion)" PrivateAssets="All"/>
-    <PackageReference Include="Microsoft.Extensions.TaskCache.Sources" Version="$(AspNetCoreVersion)" PrivateAssets="All"/>
     <PackageReference Include="Microsoft.Extensions.TypeNameHelper.Sources" Version="$(AspNetCoreVersion)" PrivateAssets="All"/>
     <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="$(CoreFxVersion)" />
     <DotNetCliToolReference Include="RazorPageGenerator" Version="$(AspNetCoreVersion)" />

src/Microsoft.AspNetCore.Diagnostics/StatusCodePage/StatusCodePagesExtensions.cs

@@ -6,7 +6,6 @@ using System.Globalization;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Diagnostics;
 using Microsoft.AspNetCore.Http;
-using Microsoft.Extensions.Internal;
 using Microsoft.Extensions.Options;
 
 namespace Microsoft.AspNetCore.Builder
@@ -119,7 +118,7 @@ namespace Microsoft.AspNetCore.Builder
                 {
                     var location = string.Format(CultureInfo.InvariantCulture, locationFormat, context.HttpContext.Response.StatusCode);
                     context.HttpContext.Response.Redirect(context.HttpContext.Request.PathBase + location);
-                    return TaskCache.CompletedTask;
+                    return Task.CompletedTask;
                 });
             }
             else
@@ -128,7 +127,7 @@ namespace Microsoft.AspNetCore.Builder
                 {
                     var location = string.Format(CultureInfo.InvariantCulture, locationFormat, context.HttpContext.Response.StatusCode);
                     context.HttpContext.Response.Redirect(location);
-                    return TaskCache.CompletedTask;
+                    return Task.CompletedTask;
                 });
             }
         }