Mark importing constructor obsolete

src/VisualStudio/Core/Def/Implementation/Utilities/VisualStudioWaitIndicator.cs

@@ -5,6 +5,7 @@
 using System.Linq;
 using System.Threading;
 using Microsoft.CodeAnalysis.Editor.Host;
+using Microsoft.CodeAnalysis.Host.Mef;
 using Microsoft.CodeAnalysis.Internal.Log;
 using Microsoft.CodeAnalysis.Notification;
 using Microsoft.VisualStudio.ComponentModelHost;
@@ -22,6 +23,7 @@ internal sealed class VisualStudioWaitIndicator : IWaitIndicator
         private static readonly Func<string, string, string> s_messageGetter = (t, m) => string.Format("{0} : {1}", t, m);
 
         [ImportingConstructor]
+        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
         public VisualStudioWaitIndicator(SVsServiceProvider serviceProvider)
         {
             _serviceProvider = serviceProvider;