Remove stale-while-revalidate experimental implementation.

net/http/http_network_session.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/http/http_network_session.h"
 
 #include <utility>
 
 #include "base/compiler_specific.h"
 #include "base/debug/stack_trace.h"
@@ skipping 57 matching lines @@
       channel_id_service(NULL),
       transport_security_state(NULL),
       cert_transparency_verifier(NULL),
       proxy_service(NULL),
       ssl_config_service(NULL),
       http_auth_handler_factory(NULL),
       network_delegate(NULL),
       net_log(NULL),
       host_mapping_rules(NULL),
       ignore_certificate_errors(false),
-      use_stale_while_revalidate(false),
       testing_fixed_http_port(0),
       testing_fixed_https_port(0),
       enable_tcp_fast_open_for_ssl(false),
       enable_spdy_compression(true),
       enable_spdy_ping_based_connection_checking(true),
       spdy_default_protocol(kProtoUnknown),
       spdy_session_max_recv_window_size(kSpdySessionMaxRecvWindowSize),
       spdy_stream_max_recv_window_size(kSpdyStreamMaxRecvWindowSize),
       spdy_initial_max_concurrent_streams(0),
       time_func(&base::TimeTicks::Now),
@@ skipping 234 matching lines @@
     case WEBSOCKET_SOCKET_POOL:
       return websocket_socket_pool_manager_.get();
     default:
       NOTREACHED();
       break;
   }
   return NULL;
 }
 
 }  // namespace net