Provide mutable members of UrlRequestContext via pure-virtual interface

net/url_request/url_request_context.cc

Index: net/url_request/url_request_context.cc
diff --git a/net/url_request/url_request_context.cc b/net/url_request/url_request_context.cc
index 42a578961e72c8c66fd310f2bf1de718dc6c67d7..94d7f22e1007a98017e6d56e3230c00bae623498 100644
--- a/net/url_request/url_request_context.cc
+++ b/net/url_request/url_request_context.cc
@@ -12,6 +12,7 @@
 #include "net/cookies/cookie_store.h"
 #include "net/ftp/ftp_transaction_factory.h"
 #include "net/http/http_transaction_factory.h"
+#include "net/url_request/http_user_agent_settings.h"
 #include "net/url_request/url_request.h"
 
 namespace net {
@@ -26,6 +27,7 @@ URLRequestContext::URLRequestContext()
       proxy_service_(NULL),
       network_delegate_(NULL),
       http_server_properties_(NULL),
+      http_user_agent_settings_(NULL),
       transport_security_state_(NULL),
 #if !defined(DISABLE_FTP_SUPPORT)
       ftp_auth_cache_(new FtpAuthCache),
@@ -56,12 +58,11 @@ void URLRequestContext::CopyFrom(const URLRequestContext* other) {
   set_cookie_store(other->cookie_store_);
   set_transport_security_state(other->transport_security_state_);
   // FTPAuthCache is unique per context.
-  set_accept_language(other->accept_language_);
-  set_accept_charset(other->accept_charset_);
   set_http_transaction_factory(other->http_transaction_factory_);
   set_ftp_transaction_factory(other->ftp_transaction_factory_);
   set_job_factory(other->job_factory_);
   set_throttler_manager(other->throttler_manager_);
+  set_http_user_agent_settings(other->http_user_agent_settings_);
 }
 
 const HttpNetworkSession::Params* URLRequestContext::GetNetworkSessionParams(
@@ -84,8 +85,19 @@ void URLRequestContext::set_cookie_store(CookieStore* cookie_store) {
   cookie_store_ = cookie_store;
 }
 
-const std::string& URLRequestContext::GetUserAgent(const GURL& url) const {
-  return EmptyString();
+std::string URLRequestContext::GetAcceptCharset() const {
+  return http_user_agent_settings_ ?
+      http_user_agent_settings_->GetAcceptCharset() : EmptyString();
+}
+
+std::string URLRequestContext::GetAcceptLanguage() const {
+  return http_user_agent_settings_ ?
+      http_user_agent_settings_->GetAcceptLanguage() : EmptyString();
+}
+
+std::string URLRequestContext::GetUserAgent(const GURL& url) const {
+  return http_user_agent_settings_ ?
+      http_user_agent_settings_->GetUserAgent(url) : EmptyString();
 }
 
 void URLRequestContext::AssertNoURLRequests() const {