Remove bogus QUICHE_EXPORT_PRIVATE from QuicheLinkedHashMap.

Since the class definition is in the header file, this macro is not needed.

PiperOrigin-RevId: 414550766

common/quiche_linked_hash_map.h

diff --git a/common/quiche_linked_hash_map.h b/common/quiche_linked_hash_map.h
index 9923df3..4aa6078 100644
--- a/common/quiche_linked_hash_map.h
+++ b/common/quiche_linked_hash_map.h
@@ -41,7 +41,7 @@
           class Value,                    // QUICHE_NO_EXPORT
           class Hash = absl::Hash<Key>,   // QUICHE_NO_EXPORT
           class Eq = std::equal_to<Key>>  // QUICHE_NO_EXPORT
-class QUICHE_EXPORT_PRIVATE QuicheLinkedHashMap {
+class QuicheLinkedHashMap {               // QUICHE_NO_EXPORT
  private:
   typedef std::list<std::pair<Key, Value>> ListType;
   typedef absl::node_hash_map<Key, typename ListType::iterator, Hash, Eq>