Use quiche string libraries in third_party/quic/core

gfe-relnote: n/a, no functional change
PiperOrigin-RevId: 285401547
Change-Id: Ice6d421ff7058fe2d47aee426d7634b6d403ee3f
diff --git a/quic/core/legacy_quic_stream_id_manager.cc b/quic/core/legacy_quic_stream_id_manager.cc
index b8498b3..6e8f13a 100644
--- a/quic/core/legacy_quic_stream_id_manager.cc
+++ b/quic/core/legacy_quic_stream_id_manager.cc
@@ -8,6 +8,7 @@
 #include "net/third_party/quiche/src/quic/core/quic_utils.h"
 #include "net/third_party/quiche/src/quic/core/quic_versions.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_map_util.h"
+#include "net/third_party/quiche/src/common/platform/api/quiche_str_cat.h"
 
 namespace quic {