Move most of the component updater artifacts to update_client.

components/component_updater/request_sender.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 COMPONENTS_COMPONENT_UPDATER_REQUEST_SENDER_H_
-#define COMPONENTS_COMPONENT_UPDATER_REQUEST_SENDER_H_
-
-#include <string>
-#include <vector>
-
-#include "base/callback.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/threading/thread_checker.h"
-#include "net/url_request/url_fetcher_delegate.h"
-#include "url/gurl.h"
-
-namespace net {
-class URLFetcher;
-}
-
-namespace component_updater {
-
-class Configurator;
-
-// Sends a request to one of the urls provided. The class implements a chain
-// of responsibility design pattern, where the urls are tried in the order they
-// are specified, until the request to one of them succeeds or all have failed.
-class RequestSender : public net::URLFetcherDelegate {
- public:
-  // The |source| refers to the fetcher object used to make the request. This
-  // parameter can be NULL in some error cases.
-  typedef base::Callback<void(const net::URLFetcher* source)>
-      RequestSenderCallback;
-
-  explicit RequestSender(const Configurator& config);
-  ~RequestSender() override;
-
-  void Send(const std::string& request_string,
-            const std::vector<GURL>& urls,
-            const RequestSenderCallback& request_sender_callback);
-
- private:
-  void SendInternal();
-
-  // Overrides for URLFetcherDelegate.
-  void OnURLFetchComplete(const net::URLFetcher* source) override;
-
-  const Configurator& config_;
-  std::vector<GURL> urls_;
-  std::vector<GURL>::const_iterator cur_url_;
-  scoped_ptr<net::URLFetcher> url_fetcher_;
-  std::string request_string_;
-  RequestSenderCallback request_sender_callback_;
-
-  base::ThreadChecker thread_checker_;
-
-  DISALLOW_COPY_AND_ASSIGN(RequestSender);
-};
-
-}  // namespace component_updater
-
-#endif  // COMPONENTS_COMPONENT_UPDATER_REQUEST_SENDER_H_