Provide mutable members of UrlRequestContext via pure-virtual interface

chrome/browser/net/basic_http_user_agent_settings.h

Index: chrome/browser/net/basic_http_user_agent_settings.h
diff --git a/chrome/browser/net/basic_http_user_agent_settings.h b/chrome/browser/net/basic_http_user_agent_settings.h
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+++ b/chrome/browser/net/basic_http_user_agent_settings.h
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+// 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.
+
+#ifndef CHROME_BROWSER_NET_BASIC_HTTP_USER_AGENT_SETTINGS_H_
+#define CHROME_BROWSER_NET_BASIC_HTTP_USER_AGENT_SETTINGS_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "net/url_request/http_user_agent_settings.h"
+
+// An implementation of |HttpUserAgentSettings| that provides fixed values for
+// the HTTP headers Accept-Language and Accept-Charset and uses
+// |content::GetUserAgent| to provide the HTTP User-Agent header value.
+class BasicHttpUserAgentSettings : public net::HttpUserAgentSettings {
+ public:
+  BasicHttpUserAgentSettings(const std::string& accept_language,
+                             const std::string& accept_charset);
+  virtual ~BasicHttpUserAgentSettings();
+
+  // HttpUserAgentSettings implementation
+  virtual std::string GetAcceptLanguage() const OVERRIDE;
+  virtual std::string GetAcceptCharset() const OVERRIDE;
+  virtual std::string GetUserAgent(const GURL& url) const OVERRIDE;
+
+ private:
+  const std::string accept_language_;
+  const std::string accept_charset_;
+
+  DISALLOW_COPY_AND_ASSIGN(BasicHttpUserAgentSettings);
+};
+
+#endif  // CHROME_BROWSER_NET_BASIC_HTTP_USER_AGENT_SETTINGS_H_
+