Add QuicStringPiece which is actually StringPiece.

net/quic/core/crypto/null_encrypter.h

Index: net/quic/core/crypto/null_encrypter.h
diff --git a/net/quic/core/crypto/null_encrypter.h b/net/quic/core/crypto/null_encrypter.h
index d605d8e0667ee1d1024348de64af53e5f7cfd5e5..c768c64671654865bcc24b85617f47377918a244 100644
--- a/net/quic/core/crypto/null_encrypter.h
+++ b/net/quic/core/crypto/null_encrypter.h
@@ -12,6 +12,7 @@
 #include "net/quic/core/crypto/quic_encrypter.h"
 #include "net/quic/core/quic_types.h"
 #include "net/quic/platform/api/quic_export.h"
+#include "net/quic/platform/api/quic_string_piece.h"
 
 namespace net {
 
@@ -24,12 +25,12 @@ class QUIC_EXPORT_PRIVATE NullEncrypter : public QuicEncrypter {
   ~NullEncrypter() override {}
 
   // QuicEncrypter implementation
-  bool SetKey(base::StringPiece key) override;
-  bool SetNoncePrefix(base::StringPiece nonce_prefix) override;
+  bool SetKey(QuicStringPiece key) override;
+  bool SetNoncePrefix(QuicStringPiece nonce_prefix) override;
   bool EncryptPacket(QuicVersion version,
                      QuicPacketNumber packet_number,
-                     base::StringPiece associated_data,
-                     base::StringPiece plaintext,
+                     QuicStringPiece associated_data,
+                     QuicStringPiece plaintext,
                      char* output,
                      size_t* output_length,
                      size_t max_output_length) override;
@@ -37,8 +38,8 @@ class QUIC_EXPORT_PRIVATE NullEncrypter : public QuicEncrypter {
   size_t GetNoncePrefixSize() const override;
   size_t GetMaxPlaintextSize(size_t ciphertext_size) const override;
   size_t GetCiphertextSize(size_t plaintext_size) const override;
-  base::StringPiece GetKey() const override;
-  base::StringPiece GetNoncePrefix() const override;
+  QuicStringPiece GetKey() const override;
+  QuicStringPiece GetNoncePrefix() const override;
 
  private:
   size_t GetHashLength() const;