Remove using namespace in net/quic/quic_stream_sequencer.h

net/quic/test_tools/quic_test_utils.h

Index: net/quic/test_tools/quic_test_utils.h
diff --git a/net/quic/test_tools/quic_test_utils.h b/net/quic/test_tools/quic_test_utils.h
index 6b6efe3bf31fcc1db91cc139a76879f882c76392..dded77fdf511fdfe3fefaba8f70e0f34fb0ae46a 100644
--- a/net/quic/test_tools/quic_test_utils.h
+++ b/net/quic/test_tools/quic_test_utils.h
@@ -304,16 +304,16 @@ class MockConnection : public QuicConnection {
                                       const IPEndPoint& peer_address,
                                       const QuicEncryptedPacket& packet));
   MOCK_METHOD1(SendConnectionClose, void(QuicErrorCode error));
-  MOCK_METHOD2(SendConnectionCloseWithDetails, void(QuicErrorCode error,
-                                                    const string& details));
+  MOCK_METHOD2(SendConnectionCloseWithDetails,
+               void(QuicErrorCode error, const std::string& details));
   MOCK_METHOD2(SendConnectionClosePacket, void(QuicErrorCode error,
-                                               const string& details));
+                                               const std::string& details));
   MOCK_METHOD3(SendRstStream, void(QuicStreamId id,
                                    QuicRstStreamErrorCode error,
                                    QuicStreamOffset bytes_written));
   MOCK_METHOD3(SendGoAway, void(QuicErrorCode error,
                                 QuicStreamId last_good_stream_id,
-                                const string& reason));
+                                const std::string& reason));
   MOCK_METHOD1(SendBlocked, void(QuicStreamId id));
   MOCK_METHOD2(SendWindowUpdate, void(QuicStreamId id,
                                       QuicStreamOffset byte_offset));