Add QuicStringPiece which is actually StringPiece.

net/quic/test_tools/delayed_verify_strike_register_client.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_QUIC_TEST_TOOLS_DELAYED_VERIFY_STRIKE_REGISTER_CLIENT_H_
 #define NET_QUIC_TEST_TOOLS_DELAYED_VERIFY_STRIKE_REGISTER_CLIENT_H_
 
 #include <cstdint>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
-#include "base/strings/string_piece.h"
 #include "net/quic/core/crypto/local_strike_register_client.h"
+#include "net/quic/platform/api/quic_string_piece.h"
 
 namespace net {
 namespace test {
 
 // Test helper that allows delaying execution of nonce verification
 // callbacks until a later time.
 class DelayedVerifyStrikeRegisterClient : public LocalStrikeRegisterClient {
  public:
   DelayedVerifyStrikeRegisterClient(unsigned max_entries,
                                     uint32_t current_time_external,
                                     uint32_t window_secs,
                                     const uint8_t orbit[8],
                                     StrikeRegister::StartupType startup);
   ~DelayedVerifyStrikeRegisterClient() override;
 
-  void VerifyNonceIsValidAndUnique(base::StringPiece nonce,
+  void VerifyNonceIsValidAndUnique(QuicStringPiece nonce,
                                    QuicWallTime now,
                                    ResultCallback* cb) override;
 
   // Start queueing verifications instead of executing them immediately.
   void StartDelayingVerification() { delay_verifications_ = true; }
   // Number of verifications that are queued.
   int PendingVerifications() const;
   // Run all pending verifications.
   void RunPendingVerifications();
 
  private:
   struct VerifyArgs {
-    VerifyArgs(base::StringPiece in_nonce,
+    VerifyArgs(QuicStringPiece in_nonce,
                QuicWallTime in_now,
                ResultCallback* in_cb)
         : nonce(in_nonce.as_string()), now(in_now), cb(in_cb) {}
 
     std::string nonce;
     QuicWallTime now;
     ResultCallback* cb;
   };
 
   bool delay_verifications_;
   std::vector<VerifyArgs> pending_verifications_;
 
   DISALLOW_COPY_AND_ASSIGN(DelayedVerifyStrikeRegisterClient);
 };
 
 }  // namespace test
 }  // namespace net
 
 #endif  // NET_QUIC_TEST_TOOLS_DELAYED_VERIFY_STRIKE_REGISTER_CLIENT_H_