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_session.h b/quic/core/quic_session.h
index 68cc96e..0120357 100644
--- a/quic/core/quic_session.h
+++ b/quic/core/quic_session.h
@@ -10,6 +10,7 @@
 #include <cstddef>
 #include <map>
 #include <memory>
+#include <string>
 #include <vector>
 
 #include "base/macros.h"
@@ -27,7 +28,6 @@
 #include "net/third_party/quiche/src/quic/platform/api/quic_containers.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_export.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_socket_address.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_string.h"
 
 namespace quic {