Remove optional parameter.

src/Features/Core/Portable/AddImport/CodeActions/AddImportCodeAction.cs

@@ -20,7 +20,7 @@ private abstract class AddImportCodeAction : CodeAction
         {
             protected readonly AddImportFixData FixData;
 
-            public sealed override string Title { get; }
+            public override string Title { get; }
             public sealed override ImmutableArray<string> Tags { get; }
             internal sealed override CodeActionPriority Priority { get; }
 
@@ -38,13 +38,12 @@ private abstract class AddImportCodeAction : CodeAction
 
             protected AddImportCodeAction(
                 Document originalDocument,
-                AddImportFixData fixData,
-                string titleOpt = null)
+                AddImportFixData fixData)
             {
                 OriginalDocument = originalDocument;
                 FixData = fixData;
 
-                Title = titleOpt ?? fixData.Title;
+                Title = fixData.Title;
                 Tags = fixData.Tags;
                 Priority = fixData.Priority;
                 _textChanges = fixData.TextChanges;

src/Features/Core/Portable/AddImport/CodeActions/InstallPackageAndAddImportCodeAction.cs

@@ -16,6 +16,8 @@ internal abstract partial class AbstractAddImportCodeFixProvider<TSimpleNameSynt
     {
             private class InstallPackageAndAddImportCodeAction : AddImportCodeAction
             {
+                public override string Title { get; }
+
                 /// <summary>
                 /// The operation that will actually install the nuget package.
                 /// </summary>
@@ -26,9 +28,10 @@ private class InstallPackageAndAddImportCodeAction : AddImportCodeAction
                     AddImportFixData fixData,
                     string title,
                     InstallPackageDirectlyCodeActionOperation installOperation)
-                    : base(originalDocument, fixData, title)
+                    : base(originalDocument, fixData)
                 {
                     Contract.ThrowIfFalse(fixData.Kind == AddImportFixKind.PackageSymbol);
+                    Title = title;
                     _installOperation = installOperation;
                 }