Deprecate FLAGS_quic_export_rej_for_all_rejects.

net/quic/core/crypto/quic_crypto_server_config.cc

Index: net/quic/core/crypto/quic_crypto_server_config.cc
diff --git a/net/quic/core/crypto/quic_crypto_server_config.cc b/net/quic/core/crypto/quic_crypto_server_config.cc
index 27cc291890a44bdf158202904a647dc4064cfb3f..e012f2716c7c4b0338c889db68b5ee44ae0f4c93 100644
--- a/net/quic/core/crypto/quic_crypto_server_config.cc
+++ b/net/quic/core/crypto/quic_crypto_server_config.cc
@@ -774,8 +774,7 @@ void QuicCryptoServerConfig::ProcessClientHelloAfterGetProof(
                    use_stateless_rejects, server_designated_connection_id, rand,
                    compressed_certs_cache, params, *signed_config,
                    total_framing_overhead, chlo_packet_size, out.get());
-    if (FLAGS_quic_reloadable_flag_quic_export_rej_for_all_rejects &&
-        rejection_observer_ != nullptr) {
+    if (rejection_observer_ != nullptr) {
       rejection_observer_->OnRejectionBuilt(info.reject_reasons, out.get());
     }
     helper.Succeed(std::move(out), std::move(out_diversification_nonce),