Add QuicStringPiece which is actually StringPiece.

net/quic/core/crypto/crypto_secret_boxer_test.cc

 // 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.
 
 #include "net/quic/core/crypto/crypto_secret_boxer.h"
 
 #include "net/quic/core/crypto/quic_random.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using base::StringPiece;
 using std::string;
 
 namespace net {
 namespace test {
 
 TEST(CryptoSecretBoxerTest, BoxAndUnbox) {
-  StringPiece message("hello world");
+  QuicStringPiece message("hello world");
 
   CryptoSecretBoxer boxer;
   boxer.SetKeys({string(CryptoSecretBoxer::GetKeySize(), 0x11)});
 
   const string box = boxer.Box(QuicRandom::GetInstance(), message);
 
   string storage;
-  StringPiece result;
+  QuicStringPiece result;
   EXPECT_TRUE(boxer.Unbox(box, &storage, &result));
   EXPECT_EQ(result, message);
 
   EXPECT_FALSE(boxer.Unbox(string(1, 'X') + box, &storage, &result));
   EXPECT_FALSE(boxer.Unbox(box.substr(1, string::npos), &storage, &result));
   EXPECT_FALSE(boxer.Unbox(string(), &storage, &result));
   EXPECT_FALSE(
       boxer.Unbox(string(1, box[0] ^ 0x80) + box.substr(1, string::npos),
                   &storage, &result));
 }
 
 // Helper function to test whether one boxer can decode the output of another.
 static bool CanDecode(const CryptoSecretBoxer& decoder,
                       const CryptoSecretBoxer& encoder) {
-  StringPiece message("hello world");
+  QuicStringPiece message("hello world");
   const string boxed = encoder.Box(QuicRandom::GetInstance(), message);
   string storage;
-  StringPiece result;
+  QuicStringPiece result;
   bool ok = decoder.Unbox(boxed, &storage, &result);
   if (ok) {
     EXPECT_EQ(result, message);
   }
   return ok;
 }
 
 TEST(CryptoSecretBoxerTest, MultipleKeys) {
   string key_11(CryptoSecretBoxer::GetKeySize(), 0x11);
   string key_12(CryptoSecretBoxer::GetKeySize(), 0x12);
@@ skipping 16 matching lines @@
   EXPECT_TRUE(CanDecode(boxer, boxer_12));
 
   // After we flush key_11 from |boxer|, it can no longer decode tokens from
   // |boxer_11|.
   boxer.SetKeys({key_12});
   EXPECT_FALSE(CanDecode(boxer, boxer_11));
 }
 
 }  // namespace test
 }  // namespace net