Remove released languge features from experiments.

Change-Id: I3b3398f8c7a932e2b4e0ceace20d10ff0d520150
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/264727
Reviewed-by: Samuel Rawlins <srawlins@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>

pkg/analyzer/test/src/dart/resolution/context_collection_resolution.dart

@@ -331,11 +331,8 @@ class PubPackageResolutionTest extends ContextResolutionTest {
   List<String> get collectionIncludedPaths => [workspaceRootPath];
 
   List<String> get experiments => [
-        EnableString.enhanced_enums,
         EnableString.macros,
-        EnableString.named_arguments_anywhere,
         EnableString.records,
-        EnableString.super_parameters,
       ];
 
   @override