Use quiche string libraries in third_party/quic/core

gfe-relnote: n/a, no functional change
PiperOrigin-RevId: 285401547
Change-Id: Ice6d421ff7058fe2d47aee426d7634b6d403ee3f
diff --git a/quic/core/tls_handshaker.h b/quic/core/tls_handshaker.h
index 14503cd..8fb5e38 100644
--- a/quic/core/tls_handshaker.h
+++ b/quic/core/tls_handshaker.h
@@ -14,6 +14,7 @@
 #include "net/third_party/quiche/src/quic/core/crypto/tls_connection.h"
 #include "net/third_party/quiche/src/quic/core/quic_session.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_export.h"
+#include "net/third_party/quiche/src/common/platform/api/quiche_string_piece.h"
 
 namespace quic {
 
@@ -37,7 +38,8 @@
   ~TlsHandshaker() override;
 
   // From CryptoMessageParser
-  bool ProcessInput(QuicStringPiece input, EncryptionLevel level) override;
+  bool ProcessInput(quiche::QuicheStringPiece input,
+                    EncryptionLevel level) override;
   size_t InputBytesRemaining() const override { return 0; }
   QuicErrorCode error() const override { return parser_error_; }
   const std::string& error_detail() const override {
@@ -82,7 +84,8 @@
   // WriteMessage is called when there is |data| from the TLS stack ready for
   // the QUIC stack to write in a crypto frame. The data must be transmitted at
   // encryption level |level|.
-  void WriteMessage(EncryptionLevel level, QuicStringPiece data) override;
+  void WriteMessage(EncryptionLevel level,
+                    quiche::QuicheStringPiece data) override;
 
   // FlushFlight is called to signal that the current flight of
   // messages have all been written (via calls to WriteMessage) and can be