Remove QuicString wrapper for std::string

gfe-relnote: n/a (no functional change)
PiperOrigin-RevId: 238124961
Change-Id: I36e66a4326b4118d70effd356aef9734d2893763
diff --git a/quic/core/crypto/crypto_protocol.h b/quic/core/crypto/crypto_protocol.h
index d3304ba..d9a1ebc 100644
--- a/quic/core/crypto/crypto_protocol.h
+++ b/quic/core/crypto/crypto_protocol.h
@@ -6,9 +6,9 @@
 #define QUICHE_QUIC_CORE_CRYPTO_CRYPTO_PROTOCOL_H_
 
 #include <cstddef>
+#include <string>
 
 #include "net/third_party/quiche/src/quic/core/quic_tag.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_string.h"
 
 // Version and Crypto tags are written to the wire with a big-endian
 // representation of the name of the tag.  For example