IOThread: Move more stuff into system context's URLRequestContextStore.

net/url_request/url_request_context.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.
 
 // This class represents contextual information (cookies, cache, etc.)
 // that's necessary when processing resource requests.
 
 #ifndef NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_
 #define NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_
 
@@ skipping 222 matching lines @@
   // additionally call AssertNoURLRequests() within their own destructor,
   // prior to implicit destruction of subclass-owned state.
   void AssertNoURLRequests() const;
 
   // Get the underlying |HttpUserAgentSettings| implementation that provides
   // the HTTP Accept-Language and User-Agent header values.
   const HttpUserAgentSettings* http_user_agent_settings() const {
     return http_user_agent_settings_;
   }
   void set_http_user_agent_settings(
-      HttpUserAgentSettings* http_user_agent_settings) {
+      const HttpUserAgentSettings* http_user_agent_settings) {
     http_user_agent_settings_ = http_user_agent_settings;
   }
 
   // Gets the NetworkQualityEstimator associated with this context.
   // May return nullptr.
   NetworkQualityEstimator* network_quality_estimator() const {
     return network_quality_estimator_;
   }
   void set_network_quality_estimator(
       NetworkQualityEstimator* network_quality_estimator) {
@@ skipping 37 matching lines @@
   // provide storage elsewhere or have a subclass take ownership.
   NetLog* net_log_;
   HostResolver* host_resolver_;
   CertVerifier* cert_verifier_;
   ChannelIDService* channel_id_service_;
   HttpAuthHandlerFactory* http_auth_handler_factory_;
   ProxyService* proxy_service_;
   scoped_refptr<SSLConfigService> ssl_config_service_;
   NetworkDelegate* network_delegate_;
   HttpServerProperties* http_server_properties_;
-  HttpUserAgentSettings* http_user_agent_settings_;
+  const HttpUserAgentSettings* http_user_agent_settings_;
   CookieStore* cookie_store_;
   TransportSecurityState* transport_security_state_;
   CTVerifier* cert_transparency_verifier_;
   CTPolicyEnforcer* ct_policy_enforcer_;
   HttpTransactionFactory* http_transaction_factory_;
   const URLRequestJobFactory* job_factory_;
   URLRequestThrottlerManager* throttler_manager_;
   URLRequestBackoffManager* backoff_manager_;
   SdchManager* sdch_manager_;
   NetworkQualityEstimator* network_quality_estimator_;
@@ skipping 20 matching lines @@
   // The largest number of outstanding URLRequests that have been created by
   // |this| and are not yet destroyed. This doesn't need to be in CopyFrom.
   mutable size_t largest_outstanding_requests_count_seen_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestContext);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_CONTEXT_H_