Remove QuicString wrapper for std::string

gfe-relnote: n/a (no functional change)
PiperOrigin-RevId: 238124961
Change-Id: I36e66a4326b4118d70effd356aef9734d2893763
diff --git a/quic/core/quic_utils.cc b/quic/core/quic_utils.cc
index 0ec92ac..24d1eb8 100644
--- a/quic/core/quic_utils.cc
+++ b/quic/core/quic_utils.cc
@@ -6,6 +6,7 @@
 
 #include <algorithm>
 #include <cstdint>
+#include <string>
 
 #include "net/third_party/quiche/src/quic/core/quic_constants.h"
 #include "net/third_party/quiche/src/quic/core/quic_types.h"
@@ -15,7 +16,6 @@
 #include "net/third_party/quiche/src/quic/platform/api/quic_endian.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_flags.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_prefetch.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_string.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_uint128.h"
 
 namespace quic {