referrer_charset is a lie. It's really the user's default_charset.

chrome/browser/profiles/profile_io_data.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/profiles/profile_io_data.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 184 matching lines @@
 
   params->appcache_service = profile->GetAppCacheService();
 
   // Set up Accept-Language and Accept-Charset header values
   params->accept_language = net::HttpUtil::GenerateAcceptLanguageHeader(
       pref_service->GetString(prefs::kAcceptLanguages));
   std::string default_charset =
       pref_service->GetString(prefs::kGlobalDefaultCharset);
   params->accept_charset =
       net::HttpUtil::GenerateAcceptCharsetHeader(default_charset);
-
-  // At this point, we don't know the charset of the referring page
-  // where a url request originates from. This is used to get a suggested
-  // filename from Content-Disposition header made of raw 8bit characters.
-  // Down the road, it can be overriden if it becomes known (for instance,
-  // when download request is made through the context menu in a web page).
-  // At the moment, it'll remain 'undeterministic' when a user
-  // types a URL in the omnibar or click on a download link in a page.
-  // For the latter, we need a change on the webkit-side.
-  // We initialize it to the default charset here and a user will
-  // have an *arguably* better default charset for interpreting a raw 8bit
-  // C-D header field.  It means the native OS codepage fallback in
-  // net_util::GetSuggestedFilename is unlikely to be taken.
-  params->referrer_charset = default_charset;
-
+  params->default_charset = default_charset;
   params->io_thread = g_browser_process->io_thread();
   params->audio_manager = g_browser_process->audio_manager();
 
   params->host_content_settings_map = profile->GetHostContentSettingsMap();
   params->cookie_settings = CookieSettings::GetForProfile(profile);
   params->host_zoom_map = profile->GetHostZoomMap();
   params->ssl_config_service = profile->GetSSLConfigService();
   base::Callback<Profile*(void)> profile_getter =
       base::Bind(&GetProfileOnUI, g_browser_process->profile_manager(),
                  profile);
@@ skipping 288 matching lines @@
 
   profile_params_.reset();
   initialized_ = true;
 }
 
 void ProfileIOData::ApplyProfileParamsToContext(
     ChromeURLRequestContext* context) const {
   context->set_is_incognito(profile_params_->is_incognito);
   context->set_accept_language(profile_params_->accept_language);
   context->set_accept_charset(profile_params_->accept_charset);
-  context->set_referrer_charset(profile_params_->referrer_charset);
+  context->set_default_charset(profile_params_->default_charset);
   context->set_ssl_config_service(profile_params_->ssl_config_service);
 }
 
 void ProfileIOData::ShutdownOnUIThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   enable_referrers_.Destroy();
   clear_local_state_on_exit_.Destroy();
   safe_browsing_enabled_.Destroy();
 #if defined(ENABLE_CONFIGURATION_POLICY)
   if (url_blacklist_manager_.get())
     url_blacklist_manager_->ShutdownOnUIThread();
 #endif
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(
           &ResourceDispatcherHost::CancelRequestsForContext,
           base::Unretained(ResourceDispatcherHost::Get()),
           &resource_context_));
   bool posted = BrowserThread::DeleteSoon(BrowserThread::IO, FROM_HERE, this);
   if (!posted)
     delete this;
 }
 
 void ProfileIOData::set_origin_bound_cert_service(
     net::OriginBoundCertService* origin_bound_cert_service) const {
   origin_bound_cert_service_.reset(origin_bound_cert_service);
 }