Update from https://crrev.com/302630

net/http/http_network_transaction.h

 // 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.
 
 #ifndef NET_HTTP_HTTP_NETWORK_TRANSACTION_H_
 #define NET_HTTP_HTTP_NETWORK_TRANSACTION_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 160 matching lines @@
   int DoSendRequestComplete(int result);
   int DoReadHeaders();
   int DoReadHeadersComplete(int result);
   int DoReadBody();
   int DoReadBodyComplete(int result);
   int DoDrainBodyForAuthRestart();
   int DoDrainBodyForAuthRestartComplete(int result);
 
   void BuildRequestHeaders(bool using_proxy);
 
-  // Record histogram of time until first byte of header is received.
-  void LogTransactionConnectedMetrics();
-
-  // Record histogram of latency (durations until last byte received).
-  void LogTransactionMetrics() const;
-
   // Writes a log message to help debugging in the field when we block a proxy
   // response to a CONNECT request.
   void LogBlockedTunnelResponse(int response_code) const;
 
   // Called to handle a client certificate request.
   int HandleCertificateRequest(int error);
 
   // Called to possibly handle a client authentication error.
   void HandleClientAuthError(int error);
 
@@ skipping 78 matching lines @@
 
   // |proxy_info_| is the ProxyInfo used by the HttpStreamRequest.
   ProxyInfo proxy_info_;
 
   scoped_ptr<HttpStreamRequest> stream_request_;
   scoped_ptr<HttpStreamBase> stream_;
 
   // True if we've validated the headers that the stream parser has returned.
   bool headers_valid_;
 
-  // True if we've logged the time of the first response byte.  Used to
-  // prevent logging across authentication activity where we see multiple
-  // responses.
-  bool logged_response_time_;
-
   SSLConfig server_ssl_config_;
   SSLConfig proxy_ssl_config_;
   // fallback_error_code contains the error code that caused the last TLS
   // fallback. If the fallback connection results in
   // ERR_SSL_INAPPROPRIATE_FALLBACK (i.e. the server indicated that the
   // fallback should not have been needed) then we use this value to return the
   // original error that triggered the fallback.
   int fallback_error_code_;
 
   HttpRequestHeaders request_headers_;
 
   // The size in bytes of the buffer we use to drain the response body that
   // we want to throw away.  The response body is typically a small error
   // page just a few hundred bytes long.
   static const int kDrainBodyBufferSize = 1024;
 
   // User buffer and length passed to the Read method.
   scoped_refptr<IOBuffer> read_buf_;
   int read_buf_len_;
 
   // Total number of bytes received on streams for this transaction.
   int64 total_received_bytes_;
 
-  // The time the Start method was called.
-  base::Time start_time_;
-
   // When the transaction started / finished sending the request, including
   // the body, if present.
   base::TimeTicks send_start_time_;
   base::TimeTicks send_end_time_;
 
   // The next state in the state machine.
   State next_state_;
 
   // True when the tunnel is in the process of being established - we can't
   // read from the socket until the tunnel is done.
   bool establishing_tunnel_;
 
   // The helper object to use to create WebSocketHandshakeStreamBase
   // objects. Only relevant when establishing a WebSocket connection.
   WebSocketHandshakeStreamBase::CreateHelper*
       websocket_handshake_stream_base_create_helper_;
 
   BeforeNetworkStartCallback before_network_start_callback_;
   BeforeProxyHeadersSentCallback before_proxy_headers_sent_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpNetworkTransaction);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_TRANSACTION_H_