Use quiche string libraries in third_party/quic/quartc

gfe-relnote: n/a, no functional change
PiperOrigin-RevId: 285209158
Change-Id: I5c208ceed99a1cab430ce8b24672a0f132cdc4dc
diff --git a/quic/quartc/quartc_multiplexer.cc b/quic/quartc/quartc_multiplexer.cc
index cb7d77c..3abc3cd 100644
--- a/quic/quartc/quartc_multiplexer.cc
+++ b/quic/quartc/quartc_multiplexer.cc
@@ -10,6 +10,7 @@
 #include "net/third_party/quiche/src/quic/core/quic_data_writer.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_mem_slice.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_mem_slice_span.h"
+#include "net/third_party/quiche/src/common/platform/api/quiche_string_piece.h"
 
 namespace quic {
 
@@ -176,7 +177,7 @@
   session_delegate_->OnConnectionClosed(frame, source);
 }
 
-void QuartcMultiplexer::OnMessageReceived(QuicStringPiece message) {
+void QuartcMultiplexer::OnMessageReceived(quiche::QuicheStringPiece message) {
   QuicDataReader reader(message);
   QuicVariableLengthIntegerLength channel_id_length =
       reader.PeekVarInt62Length();