Add QUIC_EXPORT macros

net/quic/core/quic_constants.h

Index: net/quic/core/quic_constants.h
diff --git a/net/quic/core/quic_constants.h b/net/quic/core/quic_constants.h
index 8c6447d1f8f47b6fb8c5c206566792d0092756a0..9783db0691ed952fa028f35b97612332ce61b5c2 100644
--- a/net/quic/core/quic_constants.h
+++ b/net/quic/core/quic_constants.h
@@ -6,11 +6,13 @@
 #define NET_QUIC_CORE_QUIC_CONSTANTS_H_
 
 #include <stddef.h>
+
 #include <cstdint>
 #include <limits>
 
 #include "base/macros.h"
 #include "net/quic/core/quic_types.h"
+#include "net/quic/platform/api/quic_export.h"
 
 // Definitions of constant values used throughout the QUIC code.
 
@@ -93,7 +95,7 @@ const QuicStreamId kHeadersStreamId = 3;
 
 // Header key used to identify final offset on data stream when sending HTTP/2
 // trailing headers over QUIC.
-NET_EXPORT_PRIVATE extern const char* const kFinalOffsetHeaderKey;
+QUIC_EXPORT_PRIVATE extern const char* const kFinalOffsetHeaderKey;
 
 // Maximum delayed ack time, in ms.
 const int64_t kMaxDelayedAckTimeMs = 25;