Add QuicStringPiece which is actually StringPiece.

net/quic/core/crypto/crypto_secret_boxer.h

Index: net/quic/core/crypto/crypto_secret_boxer.h
diff --git a/net/quic/core/crypto/crypto_secret_boxer.h b/net/quic/core/crypto/crypto_secret_boxer.h
index 93e6f90fc127dbda8858201b2c9aad5826d82907..d9558140e834b5c3a59cd352d4f68313c0112041 100644
--- a/net/quic/core/crypto/crypto_secret_boxer.h
+++ b/net/quic/core/crypto/crypto_secret_boxer.h
@@ -10,9 +10,9 @@
 #include <vector>
 
 #include "base/macros.h"
-#include "base/strings/string_piece.h"
 #include "net/quic/platform/api/quic_export.h"
 #include "net/quic/platform/api/quic_mutex.h"
+#include "net/quic/platform/api/quic_string_piece.h"
 
 namespace net {
 
@@ -39,16 +39,16 @@ class QUIC_EXPORT_PRIVATE CryptoSecretBoxer {
   // returns the resulting ciphertext. Since an authenticator and nonce are
   // included, the result will be slightly larger than |plaintext|. The first
   // key in the vector supplied to |SetKeys| will be used.
-  std::string Box(QuicRandom* rand, base::StringPiece plaintext) const;
+  std::string Box(QuicRandom* rand, QuicStringPiece plaintext) const;
 
   // 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,
+  bool Unbox(QuicStringPiece ciphertext,
              std::string* out_storage,
-             base::StringPiece* out) const;
+             QuicStringPiece* out) const;
 
  private:
   mutable QuicMutex lock_;