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_crypto_server_handshaker.cc b/quic/core/quic_crypto_server_handshaker.cc
index 0d16354..c5b1597 100644
--- a/quic/core/quic_crypto_server_handshaker.cc
+++ b/quic/core/quic_crypto_server_handshaker.cc
@@ -5,10 +5,10 @@
 #include "net/third_party/quiche/src/quic/core/quic_crypto_server_handshaker.h"
 
 #include <memory>
+#include <string>
 
 #include "third_party/boringssl/src/include/openssl/sha.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_arraysize.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_string.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_text_utils.h"
 
 namespace quic {