Put a TypeProvider on the TypeSystem implementations.

pkg/analysis_server/lib/src/services/refactoring/extract_method.dart

Index: pkg/analysis_server/lib/src/services/refactoring/extract_method.dart
diff --git a/pkg/analysis_server/lib/src/services/refactoring/extract_method.dart b/pkg/analysis_server/lib/src/services/refactoring/extract_method.dart
index 119b89edba94fd988b635e0e3c711c46603e5e7b..e904e1473aeb0a764def5f2f468b455e8b70396b 100644
--- a/pkg/analysis_server/lib/src/services/refactoring/extract_method.dart
+++ b/pkg/analysis_server/lib/src/services/refactoring/extract_method.dart
@@ -1219,8 +1219,7 @@ class _ReturnTypeComputer extends RecursiveAstVisitor {
       if (returnType is InterfaceType && type is InterfaceType) {
         returnType = InterfaceType.getSmartLeastUpperBound(returnType, type);
       } else {
-        returnType = context.typeSystem
-            .getLeastUpperBound(context.typeProvider, returnType, type);
+        returnType = context.typeSystem.getLeastUpperBound(returnType, type);
       }
     }
   }