Remove unused usings

src/VisualStudio/Core/Def/Implementation/ChangeSignature/ChangeSignatureDialogViewModel.ParameterViewModels.cs

@@ -3,20 +3,10 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
-using System.Collections.Generic;
-using System.Collections.Immutable;
-using System.Diagnostics;
 using System.Linq;
-using System.Windows.Controls;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.ChangeSignature;
-using Microsoft.CodeAnalysis.Editor.Shared.Extensions;
-using Microsoft.CodeAnalysis.Editor.Shared.Utilities;
-using Microsoft.CodeAnalysis.Notification;
 using Microsoft.CodeAnalysis.Shared.Extensions;
-using Microsoft.VisualStudio.LanguageServices.Implementation.Utilities;
-using Microsoft.VisualStudio.Text.Classification;
-using Roslyn.Utilities;
 
 namespace Microsoft.VisualStudio.LanguageServices.Implementation.ChangeSignature
 {