Add QuicStringPiece which is actually StringPiece.

net/quic/quartc/quartc_session_test.cc

Index: net/quic/quartc/quartc_session_test.cc
diff --git a/net/quic/quartc/quartc_session_test.cc b/net/quic/quartc/quartc_session_test.cc
index 6bc2b5904a4f588dfc60e98f1caeefcbaabdfd09..2844baf41e18d35498c0f29f47349146f7c5e065 100644
--- a/net/quic/quartc/quartc_session_test.cc
+++ b/net/quic/quartc/quartc_session_test.cc
@@ -18,6 +18,7 @@
 #include "net/quic/core/quic_crypto_client_stream.h"
 #include "net/quic/core/quic_crypto_server_stream.h"
 #include "net/quic/core/quic_simple_buffer_allocator.h"
+#include "net/quic/platform/api/quic_string_piece.h"
 #include "net/quic/platform/impl/quic_chromium_clock.h"
 #include "net/quic/quartc/quartc_alarm_factory.h"
 #include "net/quic/quartc/quartc_packet_writer.h"
@@ -57,7 +58,7 @@ class FakeProofSource : public net::ProofSource {
                 const std::string& hostname,
                 const std::string& server_config,
                 net::QuicVersion quic_version,
-                base::StringPiece chlo_hash,
+                QuicStringPiece chlo_hash,
                 const net::QuicTagVector& connection_options,
                 std::unique_ptr<Callback> callback) override {
     QuicReferenceCountedPointer<net::ProofSource::Chain> chain;
@@ -89,7 +90,7 @@ class FakeProofVerifier : public net::ProofVerifier {
       const uint16_t port,
       const std::string& server_config,
       net::QuicVersion quic_version,
-      base::StringPiece chlo_hash,
+      QuicStringPiece chlo_hash,
       const std::vector<std::string>& certs,
       const std::string& cert_sct,
       const std::string& signature,