Uses ProxyConfigServiceLinux in the chromoting host to configure proxy.

remoting/base/url_request_context_getter.h

 // Copyright 2014 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 REMOTING_BASE_URL_REQUEST_CONTEXT_GETTER_H_
 #define REMOTING_BASE_URL_REQUEST_CONTEXT_GETTER_H_
 
-#include <string>
-
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/message_loop/message_loop.h"
-#include "net/proxy/proxy_config_service.h"
-#include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_getter.h"
-#include "net/url_request/url_request_context_storage.h"
 
 namespace base {
-class MessageLoopProxy;
+class SingleThreadTaskRunner;
 }  // namespace base
 
+namespace net {
+class ProxyConfigService;
+}  // namespace net
+
 namespace remoting {
 
 class URLRequestContextGetter : public net::URLRequestContextGetter {
  public:
   URLRequestContextGetter(
-      scoped_refptr<base::SingleThreadTaskRunner> network_task_runner);
+      scoped_refptr<base::SingleThreadTaskRunner> network_task_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> file_task_runner);
 
   // Overridden from net::URLRequestContextGetter:
   virtual net::URLRequestContext* GetURLRequestContext() OVERRIDE;
   virtual scoped_refptr<base::SingleThreadTaskRunner>
       GetNetworkTaskRunner() const OVERRIDE;
 
  protected:
   virtual ~URLRequestContextGetter();
 
  private:
   scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
   scoped_ptr<net::ProxyConfigService> proxy_config_service_;
   scoped_ptr<net::URLRequestContext> url_request_context_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestContextGetter);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_BASE_URL_REQUEST_CONTEXT_GETTER_H_