Use quiche string libraries in third_party/quic/test_tools

gfe-relnote: n/a, no functional change
PiperOrigin-RevId: 285009487
Change-Id: Ib5df01e93b8567c062cac8e5469e1ff86161445f
diff --git a/quic/test_tools/quic_connection_peer.h b/quic/test_tools/quic_connection_peer.h
index b7140de..e0a97b8 100644
--- a/quic/test_tools/quic_connection_peer.h
+++ b/quic/test_tools/quic_connection_peer.h
@@ -9,7 +9,7 @@
 #include "net/third_party/quiche/src/quic/core/quic_connection_stats.h"
 #include "net/third_party/quiche/src/quic/core/quic_packets.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_piece.h"
+#include "net/third_party/quiche/src/common/platform/api/quiche_string_piece.h"
 
 namespace quic {
 
@@ -69,7 +69,7 @@
   static void SwapCrypters(QuicConnection* connection, QuicFramer* framer);
 
   static void SetCurrentPacket(QuicConnection* connection,
-                               QuicStringPiece current_packet);
+                               quiche::QuicheStringPiece current_packet);
 
   static QuicConnectionHelperInterface* GetHelper(QuicConnection* connection);