Remove using namespace in net/quic/quic_stream_sequencer.h

net/quic/quic_crypto_server_stream.cc

Index: net/quic/quic_crypto_server_stream.cc
diff --git a/net/quic/quic_crypto_server_stream.cc b/net/quic/quic_crypto_server_stream.cc
index c4b58938b332d5df7129fa9f623699eff65b1ab0..43c5892e45ea95972cefcf401325cadf96c5b51d 100644
--- a/net/quic/quic_crypto_server_stream.cc
+++ b/net/quic/quic_crypto_server_stream.cc
@@ -85,7 +85,7 @@ void QuicCryptoServerStream::FinishProcessingHandshakeMessage(
   DCHECK(validate_client_hello_cb_ != nullptr);
   validate_client_hello_cb_ = nullptr;
 
-  string error_details;
+  std::string error_details;
   CryptoHandshakeMessage reply;
   QuicErrorCode error = ProcessClientHello(
       message, result, &reply, &error_details);
@@ -175,7 +175,7 @@ void QuicCryptoServerStream::SendServerConfigUpdate(
   DVLOG(1) << "Server: Sending server config update: "
            << server_config_update_message.DebugString();
   const QuicData& data = server_config_update_message.GetSerialized();
-  WriteOrBufferData(string(data.data(), data.length()), false, nullptr);
+  WriteOrBufferData(std::string(data.data(), data.length()), false, nullptr);
 
   ++num_server_config_update_messages_sent_;
 }
@@ -191,20 +191,20 @@ void QuicCryptoServerStream::set_previous_cached_network_params(
 }
 
 bool QuicCryptoServerStream::GetBase64SHA256ClientChannelID(
-    string* output) const {
+    std::string* output) const {
   if (!encryption_established_ ||
       crypto_negotiated_params_.channel_id.empty()) {
     return false;
   }
 
-  const string& channel_id(crypto_negotiated_params_.channel_id);
+  const std::string& channel_id(crypto_negotiated_params_.channel_id);
   scoped_ptr<crypto::SecureHash> hash(
       crypto::SecureHash::Create(crypto::SecureHash::SHA256));
   hash->Update(channel_id.data(), channel_id.size());
   uint8 digest[32];
   hash->Finish(digest, sizeof(digest));
 
-  base::Base64Encode(string(
+  base::Base64Encode(std::string(
       reinterpret_cast<const char*>(digest), sizeof(digest)), output);
   // Remove padding.
   size_t len = output->size();
@@ -224,7 +224,7 @@ QuicErrorCode QuicCryptoServerStream::ProcessClientHello(
     const CryptoHandshakeMessage& message,
     const ValidateClientHelloResultCallback::Result& result,
     CryptoHandshakeMessage* reply,
-    string* error_details) {
+    std::string* error_details) {
   // Store the bandwidth estimate from the client.
   if (result.cached_network_params.bandwidth_estimate_bytes_per_second() > 0) {
     previous_cached_network_params_.reset(