[rename] Rename internal field to embedder field.

src/snapshot/serializer-common.h

Index: src/snapshot/serializer-common.h
diff --git a/src/snapshot/serializer-common.h b/src/snapshot/serializer-common.h
index b4bcf7ff73471de20bf4af61bdb0744847e62420..02f97628b5a080b9e7683744b20b24b421127afe 100644
--- a/src/snapshot/serializer-common.h
+++ b/src/snapshot/serializer-common.h
@@ -172,8 +172,8 @@ class SerializerDeserializer : public ObjectVisitor {
   // Used for the source code for compiled stubs, which is in the executable,
   // but is referred to from external strings in the snapshot.
   static const int kExtraNativesStringResource = 0x1e;
-  // Used for embedder-provided serialization data for internal fields.
-  static const int kInternalFieldsData = 0x1f;
+  // Used for embedder-provided serialization data for embedder fields.
+  static const int kEmbedderFieldsData = 0x1f;
 
   // 8 hot (recently seen or back-referenced) objects with optional skip.
   static const int kNumberOfHotObjects = 8;