Use quiche string libraries in third_party/quic/tools

gfe-relnote: n/a, no functional change
PiperOrigin-RevId: 285002617
Change-Id: If94b091b6b1c92ae3a497d13915dbe74d4e5703a
diff --git a/quic/tools/quic_backend_response.h b/quic/tools/quic_backend_response.h
index f0b7b89..6537987 100644
--- a/quic/tools/quic_backend_response.h
+++ b/quic/tools/quic_backend_response.h
@@ -6,6 +6,7 @@
 #define QUICHE_QUIC_TOOLS_QUIC_BACKEND_RESPONSE_H_
 
 #include "net/third_party/quiche/src/quic/tools/quic_url.h"
+#include "net/third_party/quiche/src/common/platform/api/quiche_string_piece.h"
 #include "net/third_party/quiche/src/spdy/core/spdy_protocol.h"
 
 namespace quic {
@@ -55,7 +56,9 @@
   SpecialResponseType response_type() const { return response_type_; }
   const spdy::SpdyHeaderBlock& headers() const { return headers_; }
   const spdy::SpdyHeaderBlock& trailers() const { return trailers_; }
-  const QuicStringPiece body() const { return QuicStringPiece(body_); }
+  const quiche::QuicheStringPiece body() const {
+    return quiche::QuicheStringPiece(body_);
+  }
 
   void set_response_type(SpecialResponseType response_type) {
     response_type_ = response_type;
@@ -67,7 +70,7 @@
   void set_trailers(spdy::SpdyHeaderBlock trailers) {
     trailers_ = std::move(trailers);
   }
-  void set_body(QuicStringPiece body) {
+  void set_body(quiche::QuicheStringPiece body) {
     body_.assign(body.data(), body.size());
   }
   uint16_t stop_sending_code() const { return stop_sending_code_; }