Remove memory cache from system URLRequestContext.

chrome/browser/io_thread.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 "chrome/browser/io_thread.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/base64.h"
@@ skipping 866 matching lines @@
   builder.set_proxy_config_service(std::move(system_proxy_config_service_));
 
   builder.set_http_network_session_params(session_params_);
 
   builder.set_data_enabled(true);
   builder.set_file_enabled(true);
 #if !BUILDFLAG(DISABLE_FTP_SUPPORT)
   builder.set_ftp_enabled(true);
 #endif
 
+  builder.DisableHttpCache();
+
   globals_->system_request_context = builder.Build();
 }
 
 // static
 void IOThread::ConfigureParamsFromFieldTrialsAndCommandLine(
     const base::CommandLine& command_line,
     bool is_quic_allowed_by_policy,
     bool http_09_on_non_default_ports_enabled,
     net::HttpNetworkSession::Params* params) {
   std::string quic_user_agent_id = chrome::GetChannelString();
@@ skipping 10 matching lines @@
   if (command_line.HasSwitch(switches::kIgnoreUrlFetcherCertRequests))
     net::URLFetcher::SetIgnoreCertificateRequests(true);
 
   params->http_09_on_non_default_ports_enabled =
       http_09_on_non_default_ports_enabled;
 }
 
 metrics::UpdateUsagePrefCallbackType IOThread::GetMetricsDataUseForwarder() {
   return base::Bind(&UpdateMetricsUsagePrefsOnUIThread);
 }