Provide mutable members of UrlRequestContext via pure-virtual interface

chrome/browser/net/basic_http_user_agent_settings.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.
+
+#ifndef CHROME_BROWSER_NET_BASIC_HTTP_USER_AGENT_SETTINGS_H_
+#define CHROME_BROWSER_NET_BASIC_HTTP_USER_AGENT_SETTINGS_H_
+
+#include "net/url_request/const_http_accept_language_and_charset.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::ConstHttpAcceptLanguageAndCharset {
+ public:
+  BasicHttpUserAgentSettings(const std::string& accept_language,
+                             const std::string& accept_charset);
+  virtual ~BasicHttpUserAgentSettings() {}
+
+  // ConstHttpAcceptLanguageAndCharset implementation
+  virtual std::string GetUserAgent(const GURL& url) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BasicHttpUserAgentSettings);
+};
+
+#endif  // CHROME_BROWSER_NET_BASIC_HTTP_USER_AGENT_SETTINGS_H_
+