Remove using namespace in net/quic/quic_stream_sequencer.h

net/quic/test_tools/mock_crypto_client_stream.cc

Index: net/quic/test_tools/mock_crypto_client_stream.cc
diff --git a/net/quic/test_tools/mock_crypto_client_stream.cc b/net/quic/test_tools/mock_crypto_client_stream.cc
index eef3b80ff83ad8bccfdddd186708849756295852..faaf3ca440e432888d6bcbeef86481d2c9bb2ac1 100644
--- a/net/quic/test_tools/mock_crypto_client_stream.cc
+++ b/net/quic/test_tools/mock_crypto_client_stream.cc
@@ -4,6 +4,8 @@
 
 #include "net/quic/test_tools/mock_crypto_client_stream.h"
 
+#include <string>
+
 #include "net/quic/crypto/quic_decrypter.h"
 #include "net/quic/quic_client_session_base.h"
 #include "net/quic/quic_server_id.h"
@@ -95,7 +97,7 @@ void MockCryptoClientStream::SetConfigNegotiated() {
 
   CryptoHandshakeMessage msg;
   session()->config()->ToHandshakeMessage(&msg);
-  string error_details;
+  std::string error_details;
   const QuicErrorCode error =
       session()->config()->ProcessPeerHello(msg, CLIENT, &error_details);
   ASSERT_EQ(QUIC_NO_ERROR, error);