Remove using namespace in net/quic/quic_stream_sequencer.h

net/quic/crypto/crypto_utils_test.cc

Index: net/quic/crypto/crypto_utils_test.cc
diff --git a/net/quic/crypto/crypto_utils_test.cc b/net/quic/crypto/crypto_utils_test.cc
index 882a9b50754f5d32784954e49fc7b5680cfb649d..0a12d5b52fd3b467eb92104d00ddd7a9613a0ead 100644
--- a/net/quic/crypto/crypto_utils_test.cc
+++ b/net/quic/crypto/crypto_utils_test.cc
@@ -4,6 +4,8 @@
 
 #include "net/quic/crypto/crypto_utils.h"
 
+#include <string>
+
 #include "net/quic/test_tools/quic_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -95,20 +97,20 @@ TEST(CryptoUtilsTest, TestExportKeyingMaterial) {
 
   for (size_t i = 0; i < arraysize(test_vector); i++) {
     // Decode the test vector.
-    string subkey_secret;
-    string label;
-    string context;
+    std::string subkey_secret;
+    std::string label;
+    std::string context;
     ASSERT_TRUE(DecodeHexString(test_vector[i].subkey_secret, &subkey_secret));
     ASSERT_TRUE(DecodeHexString(test_vector[i].label, &label));
     ASSERT_TRUE(DecodeHexString(test_vector[i].context, &context));
     size_t result_len = test_vector[i].result_len;
     bool expect_ok = test_vector[i].expected != nullptr;
-    string expected;
+    std::string expected;
     if (expect_ok) {
       ASSERT_TRUE(DecodeHexString(test_vector[i].expected, &expected));
     }
 
-    string result;
+    std::string result;
     bool ok = CryptoUtils::ExportKeyingMaterial(subkey_secret,
                                                 label,
                                                 context,