Provide mutable members of UrlRequestContext via pure-virtual interface

net/url_request/url_request_context_builder.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 is useful for building a simple URLRequestContext. Most creators
 // of new URLRequestContexts should use this helper class to construct it. Call
 // any configuration params, and when done, invoke Build() to construct the
 // URLRequestContext. This URLRequestContext will own all its own storage.
 //
 // URLRequestContextBuilder and its associated params classes are initially
@@ skipping 54 matching lines @@
     std::string trusted_spdy_proxy;
   };
 
   URLRequestContextBuilder();
   ~URLRequestContextBuilder();
 
 #if defined(OS_LINUX) || defined(OS_ANDROID)
   void set_proxy_config_service(ProxyConfigService* proxy_config_service);
 #endif  // defined(OS_LINUX) || defined(OS_ANDROID)
 
-  // Call this function to specify a hard-coded User-Agent for all requests that
-  // don't have a User-Agent already set.
+  // Call these functions to specify hard-coded Accept-Language,
+  // Accept-Charset, or User-Agent header values for all requests that don't
+  // have the headers already set.
+  void set_accept_language(const std::string& accept_language) {
+    accept_language_ = accept_language;
+  }
+  void set_accept_charset(const std::string& accept_charset) {
+    accept_charset_ = accept_charset;
+  }
   void set_user_agent(const std::string& user_agent) {
     user_agent_ = user_agent;
   }
 
   // By default it's disabled.
   void set_ftp_enabled(bool enable) {
     ftp_enabled_ = enable;
   }
 
   // Uses BasicNetworkDelegate by default. Note that calling Build will unset
@@ skipping 14 matching lines @@
 
   // Override default net::HttpNetworkSession::Params settings.
   void set_http_network_session_params(
       const HttpNetworkSessionParams& http_network_session_params) {
     http_network_session_params_ = http_network_session_params;
   }
 
   URLRequestContext* Build();
 
  private:
+  std::string accept_language_;
+  std::string accept_charset_;
   std::string user_agent_;
   bool ftp_enabled_;
   bool http_cache_enabled_;
   HttpCacheParams http_cache_params_;
   HttpNetworkSessionParams http_network_session_params_;
 #if defined(OS_LINUX) || defined(OS_ANDROID)
   scoped_ptr<ProxyConfigService> proxy_config_service_;
 #endif  // defined(OS_LINUX) || defined(OS_ANDROID)
   scoped_ptr<NetworkDelegate> network_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestContextBuilder);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_CONTEXT_BUILDER_H_