Move most of the component updater artifacts to update_client.

components/update_client/url_fetcher_downloader.h

Index: components/update_client/url_fetcher_downloader.h
diff --git a/components/update_client/url_fetcher_downloader.h b/components/update_client/url_fetcher_downloader.h
new file mode 100644
index 0000000000000000000000000000000000000000..7a8e3b24c6e34b72cd8dac9b06b8b41c6c32847c
--- /dev/null
+++ b/components/update_client/url_fetcher_downloader.h
@@ -0,0 +1,60 @@
+// 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_UPDATE_CLIENT_URL_FETCHER_DOWNLOADER_H_
+#define COMPONENTS_UPDATE_CLIENT_URL_FETCHER_DOWNLOADER_H_
+
+#include <stdint.h>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "base/time/time.h"
+#include "components/update_client/crx_downloader.h"
+#include "net/url_request/url_fetcher_delegate.h"
+
+namespace net {
+class URLFetcher;
+class URLRequestContextGetter;
+}
+
+namespace update_client {
+
+// Implements a CRX downloader in top of the URLFetcher.
+class UrlFetcherDownloader : public CrxDownloader,
+                             public net::URLFetcherDelegate {
+ protected:
+  friend class CrxDownloader;
+  UrlFetcherDownloader(scoped_ptr<CrxDownloader> successor,
+                       net::URLRequestContextGetter* context_getter,
+                       scoped_refptr<base::SequencedTaskRunner> task_runner);
+  ~UrlFetcherDownloader() override;
+
+ private:
+  // Overrides for CrxDownloader.
+  void DoStartDownload(const GURL& url) override;
+
+  // Overrides for URLFetcherDelegate.
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
+  void OnURLFetchDownloadProgress(const net::URLFetcher* source,
+                                  int64_t current,
+                                  int64_t total) override;
+  scoped_ptr<net::URLFetcher> url_fetcher_;
+  net::URLRequestContextGetter* context_getter_;
+  scoped_refptr<base::SequencedTaskRunner> task_runner_;
+
+  base::Time download_start_time_;
+
+  int64_t downloaded_bytes_;
+  int64_t total_bytes_;
+
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(UrlFetcherDownloader);
+};
+
+}  // namespace update_client
+
+#endif  // COMPONENTS_UPDATE_CLIENT_URL_FETCHER_DOWNLOADER_H_