diff -up chromium-117.0.5938.62/content/browser/interest_group/header_direct_from_seller_signals.cc.me chromium-117.0.5938.62/content/browser/interest_group/header_direct_from_seller_signals.cc
--- chromium-117.0.5938.62/content/browser/interest_group/header_direct_from_seller_signals.cc.me	2023-09-16 09:43:41.717545215 +0200
+++ chromium-117.0.5938.62/content/browser/interest_group/header_direct_from_seller_signals.cc	2023-09-16 09:48:07.319539585 +0200
@@ -187,7 +187,8 @@ void OnJsonDecoded(std::unique_ptr<const
 
 }  // namespace
 
-HeaderDirectFromSellerSignals::HeaderDirectFromSellerSignals() = default;
+HeaderDirectFromSellerSignals::HeaderDirectFromSellerSignals() :
+  seller_signals_(absl::nullopt), auction_signals_(absl::nullopt) { }
 
 HeaderDirectFromSellerSignals::~HeaderDirectFromSellerSignals() = default;