Fix clashing extension (until rothko is fixed to namespace its

extensions)

src/GitHub.App/ViewModels/RepositoryCreationViewModel.cs

@@ -169,7 +169,7 @@ namespace GitHub.ViewModels
             var createCommand = ReactiveCommand.CreateAsyncObservable(canCreate, OnCreateRepository);
             createCommand.ThrownExceptions.Subscribe(ex =>
             {
-                if (!ex.IsCriticalException())
+                if (!Extensions.ExceptionExtensions.IsCriticalException(ex))
                 {
                     // TODO: Throw a proper error.
                     log.Error("Error creating repository.", ex);

src/GitHub.App/ViewModels/RepositoryPublishViewModel.cs

@@ -125,7 +125,7 @@ namespace GitHub.ViewModels
             var publishCommand = ReactiveCommand.CreateAsyncObservable(canCreate, OnPublishRepository);
             publishCommand.ThrownExceptions.Subscribe(ex =>
             {
-                if (!ex.IsCriticalException())
+                if (!Extensions.ExceptionExtensions.IsCriticalException(ex))
                 {
                     // TODO: Throw a proper error.
                     log.Error("Error creating repository.", ex);