Remove using namespace in net/quic/quic_stream_sequencer.h

net/quic/reliable_quic_stream_test.cc

Index: net/quic/reliable_quic_stream_test.cc
diff --git a/net/quic/reliable_quic_stream_test.cc b/net/quic/reliable_quic_stream_test.cc
index d63a5d824bc6e8c7bfe424e1825c404fc48a3c0d..4dfe3324fccced40ee15e21b246a24bdfe5b643a 100644
--- a/net/quic/reliable_quic_stream_test.cc
+++ b/net/quic/reliable_quic_stream_test.cc
@@ -4,6 +4,8 @@
 
 #include "net/quic/reliable_quic_stream.h"
 
+#include <string>
+
 #include "net/quic/quic_ack_notifier.h"
 #include "net/quic/quic_connection.h"
 #include "net/quic/quic_utils.h"
@@ -21,6 +23,7 @@
 
 using base::StringPiece;
 using std::min;
+using std::string;
 using testing::CreateFunctor;
 using testing::InSequence;
 using testing::Invoke;