Add QuicStringPiece which is actually StringPiece.

net/quic/core/quic_utils_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/quic_utils.h"
 
 #include "net/quic/core/crypto/crypto_protocol.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using base::StringPiece;
 using std::string;
 
 namespace net {
 namespace test {
 namespace {
 
 TEST(QuicUtilsTest, DetermineAddressChangeType) {
   const string kIPv4String1 = "1.2.3.4";
   const string kIPv4String2 = "1.2.3.5";
   const string kIPv4String3 = "1.1.3.5";
@@ skipping 67 matching lines @@
   }
   return hash;
 }
 
 TEST(QuicUtilsHashTest, ReferenceTest) {
   std::vector<uint8_t> data(32);
   for (size_t i = 0; i < data.size(); ++i) {
     data[i] = i % 255;
   }
   EXPECT_EQ(IncrementalHashReference(data.data(), data.size()),
-            QuicUtils::FNV1a_128_Hash(StringPiece(
+            QuicUtils::FNV1a_128_Hash(QuicStringPiece(
                 reinterpret_cast<const char*>(data.data()), data.size())));
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net