diff --git a/csharp/src/Google.Protobuf/Reflection/FeatureSetDescriptor.g.cs b/csharp/src/Google.Protobuf/Reflection/FeatureSetDescriptor.g.cs
deleted file mode 100644
index 208ce1f..0000000
--- a/csharp/src/Google.Protobuf/Reflection/FeatureSetDescriptor.g.cs
+++ /dev/null
@@ -1,17 +0,0 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-//
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
-#endregion
-
-namespace Google.Protobuf.Reflection;
-
-internal sealed partial class FeatureSetDescriptor
-{
-    // Canonical serialized form of the edition defaults, generated by embed_edition_defaults.
-    private const string DefaultsBase64 =
-        "ChMYhAciACoMCAEQAhgCIAMoATACChMY5wciACoMCAIQARgBIAIoATABChMY6AciDAgBEAEYASACKAEwASoAIOYHKOgH";
-}
diff --git a/src/google/protobuf/lazy_extensions_ablation_experiment.cc b/src/google/protobuf/lazy_extensions_ablation_experiment.cc
new file mode 100644
index 0000000..7310482
--- /dev/null
+++ b/src/google/protobuf/lazy_extensions_ablation_experiment.cc
@@ -0,0 +1,19 @@
+#include "third_party/tcmalloc/experiment.h"
+#include "third_party/tcmalloc/experiment_config.h"
+
+namespace google {
+namespace protobuf {
+namespace internal {
+
+// We provide this function because protobuf can't always depend directly on
+// TCMalloc experiment framework. This will be linked into binaries that use
+// TCMalloc and we can define a weak version of this function that always
+// returns false for cases in which TCMalloc is not used.
+bool IsLazyExtensionsAblationExperimentActive() {
+  return tcmalloc::IsExperimentActive(
+      tcmalloc::Experiment::PROTOBUF_LAZY_EXTENSION_ABLATION);
+}
+
+}  // namespace internal
+}  // namespace protobuf
+}  // namespace google