Remove using namespace in net/quic/quic_stream_sequencer.h

net/quic/quic_reliable_client_stream_test.cc

Index: net/quic/quic_reliable_client_stream_test.cc
diff --git a/net/quic/quic_reliable_client_stream_test.cc b/net/quic/quic_reliable_client_stream_test.cc
index caa697aa4843a3b2b43f2c46a50f125b0b310611..c7fe19ed8ea68aca5f121847eb8642fe0f734e33 100644
--- a/net/quic/quic_reliable_client_stream_test.cc
+++ b/net/quic/quic_reliable_client_stream_test.cc
@@ -4,6 +4,8 @@
 
 #include "net/quic/quic_reliable_client_stream.h"
 
+#include <string>
+
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
 #include "net/quic/quic_client_session.h"
@@ -90,7 +92,7 @@ INSTANTIATE_TEST_CASE_P(Version, QuicReliableClientStreamTest,
 
 TEST_P(QuicReliableClientStreamTest, OnFinRead) {
   InitializeHeaders();
-  string uncompressed_headers =
+  std::string uncompressed_headers =
       SpdyUtils::SerializeUncompressedHeaders(headers_);
   EXPECT_CALL(delegate_, OnDataReceived(StrEq(uncompressed_headers.data()),
                                         uncompressed_headers.size()));