Remove unnecessary use of AbstractCSharpDiagnosticProviderBasedUserDiagnosticTest

src/EditorFeatures/CSharpTest/AddAccessibilityModifiers/AddAccessibilityModifiersTests.cs

@@ -3,11 +3,7 @@
 // See the LICENSE file in the project root for more information.
 
 using System.Threading.Tasks;
-using Microsoft.CodeAnalysis.CodeFixes;
 using Microsoft.CodeAnalysis.CodeStyle;
-using Microsoft.CodeAnalysis.CSharp.AddAccessibilityModifiers;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.Diagnostics;
 using Microsoft.CodeAnalysis.Test.Utilities;
 using Xunit;
 using VerifyCS = Microsoft.CodeAnalysis.Editor.UnitTests.CodeActions.CSharpCodeFixVerifier<
@@ -16,11 +12,8 @@
 
 namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.AddAccessibilityModifiers
 {
-    public partial class AddAccessibilityModifiersTests : AbstractCSharpDiagnosticProviderBasedUserDiagnosticTest
+    public class AddAccessibilityModifiersTests
     {
-        internal override (DiagnosticAnalyzer, CodeFixProvider) CreateDiagnosticProviderAndFixer(Workspace workspace)
-            => (new CSharpAddAccessibilityModifiersDiagnosticAnalyzer(), new CSharpAddAccessibilityModifiersCodeFixProvider());
-
         [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsAddAccessibilityModifiers)]
         public void TestStandardProperties()
             => VerifyCS.VerifyStandardProperties();