Remove using namespace in net/quic/quic_stream_sequencer.h

net/quic/quic_crypto_client_stream.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_crypto_client_stream.h"
 
+#include <string>
+
 #include "base/metrics/histogram.h"
 #include "net/quic/crypto/crypto_protocol.h"
 #include "net/quic/crypto/crypto_utils.h"
 #include "net/quic/crypto/null_encrypter.h"
 #include "net/quic/quic_client_session_base.h"
 #include "net/quic/quic_protocol.h"
 #include "net/quic/quic_session.h"
 
+using std::string;
+
 namespace net {
 
 QuicCryptoClientStream::ChannelIDSourceCallbackImpl::
 ChannelIDSourceCallbackImpl(QuicCryptoClientStream* stream)
     : stream_(stream) {}
 
 QuicCryptoClientStream::ChannelIDSourceCallbackImpl::
 ~ChannelIDSourceCallbackImpl() {}
 
 void QuicCryptoClientStream::ChannelIDSourceCallbackImpl::Run(
@@ skipping 567 matching lines @@
     }
   }
   return false;
 }
 
 QuicClientSessionBase* QuicCryptoClientStream::client_session() {
   return reinterpret_cast<QuicClientSessionBase*>(session());
 }
 
 }  // namespace net