Remove an obsolete error from the spec and an obsolete command-line flag

pkg/analysis_server/lib/src/edit/edit_domain.dart

Index: pkg/analysis_server/lib/src/edit/edit_domain.dart
diff --git a/pkg/analysis_server/lib/src/edit/edit_domain.dart b/pkg/analysis_server/lib/src/edit/edit_domain.dart
index 70dd9fb00869d926422feb2841599ff679a6576e..e59fde6da0302ba334aa6caef78ecbf177b259b5 100644
--- a/pkg/analysis_server/lib/src/edit/edit_domain.dart
+++ b/pkg/analysis_server/lib/src/edit/edit_domain.dart
@@ -503,9 +503,6 @@ class EditDomainHandler extends AbstractRequestHandler {
   }
 
   Response _getAvailableRefactorings(Request request) {
-    if (searchEngine == null) {
-      return new Response.noIndexGenerated(request);
-    }
     _getAvailableRefactoringsImpl(request);
     return Response.DELAYED_RESPONSE;
   }
@@ -552,9 +549,6 @@ class EditDomainHandler extends AbstractRequestHandler {
   }
 
   Response _getRefactoring(Request request) {
-    if (searchEngine == null) {
-      return new Response.noIndexGenerated(request);
-    }
     if (refactoringManager.hasPendingRequest) {
       refactoringManager.cancel();
       _newRefactoringManager();