Remove using namespace in net/quic/quic_stream_sequencer.h

net/quic/crypto/aes_128_gcm_12_encrypter_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/crypto/aes_128_gcm_12_encrypter.h"
 
+#include <string>
+
 #include "net/quic/test_tools/quic_test_utils.h"
 
 using base::StringPiece;
+using std::string;
 
 namespace {
 
 // The AES GCM test vectors come from the file gcmEncryptExtIV128.rsp
 // downloaded from http://csrc.nist.gov/groups/STM/cavp/index.html on
 // 2013-02-01. The test vectors in that file look like this:
 //
 // [Keylen = 128]
 // [IVlen = 96]
 // [PTlen = 0]
@@ skipping 267 matching lines @@
 
 TEST(Aes128Gcm12EncrypterTest, GetCiphertextSize) {
   Aes128Gcm12Encrypter encrypter;
   EXPECT_EQ(1012u, encrypter.GetCiphertextSize(1000));
   EXPECT_EQ(112u, encrypter.GetCiphertextSize(100));
   EXPECT_EQ(22u, encrypter.GetCiphertextSize(10));
 }
 
 }  // namespace test
 }  // namespace net