Remove QuicString wrapper for std::string

gfe-relnote: n/a (no functional change)
PiperOrigin-RevId: 238124961
Change-Id: I36e66a4326b4118d70effd356aef9734d2893763
diff --git a/quic/core/packet_number_indexed_queue_test.cc b/quic/core/packet_number_indexed_queue_test.cc
index 7643fe4..c293133 100644
--- a/quic/core/packet_number_indexed_queue_test.cc
+++ b/quic/core/packet_number_indexed_queue_test.cc
@@ -6,8 +6,8 @@
 
 #include <limits>
 #include <map>
+#include <string>
 
-#include "net/third_party/quiche/src/quic/platform/api/quic_string.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_test.h"
 
 namespace quic {