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_test_server.cc b/quic/test_tools/quic_test_server.cc
index 81b54d4..3e255b4 100644
--- a/quic/test_tools/quic_test_server.cc
+++ b/quic/test_tools/quic_test_server.cc
@@ -12,6 +12,7 @@
 #include "net/third_party/quiche/src/quic/tools/quic_simple_crypto_server_stream_helper.h"
 #include "net/third_party/quiche/src/quic/tools/quic_simple_dispatcher.h"
 #include "net/third_party/quiche/src/quic/tools/quic_simple_server_session.h"
+#include "net/third_party/quiche/src/common/platform/api/quiche_string_piece.h"
 
 namespace quic {
 
@@ -95,7 +96,7 @@
   QuicServerSessionBase* CreateQuicSession(
       QuicConnectionId id,
       const QuicSocketAddress& client,
-      QuicStringPiece alpn,
+      quiche::QuicheStringPiece alpn,
       const ParsedQuicVersion& version) override {
     QuicReaderMutexLock lock(&factory_lock_);
     if (session_factory_ == nullptr && stream_factory_ == nullptr &&