Create a QUIC wrapper around a mutex and a mutex lock.

net/quic/core/crypto/crypto_secret_boxer.h

 // Copyright (c) 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_CORE_CRYPTO_CRYPTO_SECRET_BOXER_H_
 #define NET_QUIC_CORE_CRYPTO_CRYPTO_SECRET_BOXER_H_
 
 #include <stddef.h>
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/strings/string_piece.h"
-#include "base/synchronization/lock.h"
 #include "net/quic/platform/api/quic_export.h"
+#include "net/quic/platform/api/quic_mutex.h"
 
 namespace net {
 
 class QuicRandom;
 
 // CryptoSecretBoxer encrypts small chunks of plaintext (called 'boxing') and
 // then, later, can authenticate+decrypt the resulting boxes. This object is
 // thread-safe.
 class QUIC_EXPORT_PRIVATE CryptoSecretBoxer {
  public:
@@ skipping 17 matching lines @@
   // Unbox takes the result of a previous call to |Box| in |ciphertext| and
   // authenticates+decrypts it. If |ciphertext| cannot be decrypted with any of
   // the supplied keys, the function returns false. Otherwise, |out_storage| is
   // used to store the result and |out| is set to point into |out_storage| and
   // contains the original plaintext.
   bool Unbox(base::StringPiece ciphertext,
              std::string* out_storage,
              base::StringPiece* out) const;
 
  private:
-  mutable base::Lock lock_;
-  //  GUARDED_BY(lock_).mutable Mutex lock_;
-  std::vector<std::string> keys_;
+  mutable QuicMutex lock_;
+  std::vector<std::string> keys_ GUARDED_BY(lock_);
 
   DISALLOW_COPY_AND_ASSIGN(CryptoSecretBoxer);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_CRYPTO_CRYPTO_SECRET_BOXER_H_