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_versions.h b/quic/core/quic_versions.h
index 9682bd1..042c95c 100644
--- a/quic/core/quic_versions.h
+++ b/quic/core/quic_versions.h
@@ -15,12 +15,12 @@
 #ifndef QUICHE_QUIC_CORE_QUIC_VERSIONS_H_
 #define QUICHE_QUIC_CORE_QUIC_VERSIONS_H_
 
+#include <string>
 #include <vector>
 
 #include "net/third_party/quiche/src/quic/core/quic_tag.h"
 #include "net/third_party/quiche/src/quic/core/quic_types.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_export.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_string.h"
 
 namespace quic {