Remove using namespace in net/quic/quic_stream_sequencer.h

net/quic/crypto/aes_128_gcm_12_encrypter_test.cc

Index: net/quic/crypto/aes_128_gcm_12_encrypter_test.cc
diff --git a/net/quic/crypto/aes_128_gcm_12_encrypter_test.cc b/net/quic/crypto/aes_128_gcm_12_encrypter_test.cc
index 8ccaaedf30b3e882a1f1b51bd415191c9449ecff..de4cc3e92561e4bd5c485dc49a12121494fb28a1 100644
--- a/net/quic/crypto/aes_128_gcm_12_encrypter_test.cc
+++ b/net/quic/crypto/aes_128_gcm_12_encrypter_test.cc
@@ -4,6 +4,8 @@
 
 #include "net/quic/crypto/aes_128_gcm_12_encrypter.h"
 
+#include <string>
+
 #include "net/quic/test_tools/quic_test_utils.h"
 
 using base::StringPiece;
@@ -230,12 +232,12 @@ TEST(Aes128Gcm12EncrypterTest, Encrypt) {
     const TestGroupInfo& test_info = test_group_info[i];
     for (size_t j = 0; test_vectors[j].key != nullptr; j++) {
       // Decode the test vector.
-      string key;
-      string iv;
-      string pt;
-      string aad;
-      string ct;
-      string tag;
+      std::string key;
+      std::string iv;
+      std::string pt;
+      std::string aad;
+      std::string ct;
+      std::string tag;
       ASSERT_TRUE(DecodeHexString(test_vectors[j].key, &key));
       ASSERT_TRUE(DecodeHexString(test_vectors[j].iv, &iv));
       ASSERT_TRUE(DecodeHexString(test_vectors[j].pt, &pt));