Revert of Factor Chrome details out of update manifest fetching.

chrome/browser/extensions/updater/chrome_extension_downloader_factory.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 CHROME_BROWSER_EXTENSIONS_UPDATER_CHROME_EXTENSION_DOWNLOADER_FACTORY_H_
-#define CHROME_BROWSER_EXTENSIONS_UPDATER_CHROME_EXTENSION_DOWNLOADER_FACTORY_H_
-
-#include "base/memory/scoped_ptr.h"
-
-class Profile;
-
-namespace extensions {
-class ExtensionDownloader;
-class ExtensionDownloaderDelegate;
-}
-
-namespace net {
-class URLRequestContextGetter;
-}
-
-// This provides a simple static interface for constructing an
-// ExtensionDownloader suitable for use from within Chrome.
-class ChromeExtensionDownloaderFactory {
- public:
-  // Creates a downloader with the given request context. No profile identity
-  // is associated with this downloader.
-  static scoped_ptr<extensions::ExtensionDownloader> CreateForRequestContext(
-      net::URLRequestContextGetter* request_context,
-      extensions::ExtensionDownloaderDelegate* delegate);
-
-  // Creates a downloader for a given Profile. This downloader will be able
-  // to authenticate as the signed-in user in the event that it's asked to
-  // fetch a protected download.
-  static scoped_ptr<extensions::ExtensionDownloader> CreateForProfile(
-      Profile* profile,
-      extensions::ExtensionDownloaderDelegate* delegate);
-};
-
-#endif  // CHROME_BROWSER_EXTENSIONS_UPDATER_CHROME_EXTENSION_DOWNLOADER_FACTORY_H_