Remove Windows XP SHA-256 and ECDSA logic.

components/component_updater/configurator_impl.h

 // Copyright 2015 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_CONFIGURATOR_IMPL_H_
 #define COMPONENTS_COMPONENT_UPDATER_CONFIGURATOR_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 59 matching lines @@
   // The source of contexts for all the url requests.
   net::URLRequestContextGetter* RequestContext() const;
 
   // True means that this client can handle delta updates.
   bool DeltasEnabled() const;
 
   // True means that the background downloader can be used for downloading
   // non on-demand components.
   bool UseBackgroundDownloader() const;
 
-  // Setting this to false means that we'll only use secure transport (eg https)
-  // for update/ping urls. This is already false by default everywhere but older
-  // versions of Windows XP.
-  void set_enable_alt_source_url(bool enable_alt_source_url);
-
  private:
   net::URLRequestContextGetter* url_request_getter_;
   std::string extra_info_;
   GURL url_source_override_;
   bool fast_update_;
   bool pings_enabled_;
   bool deltas_enabled_;
   bool background_downloads_enabled_;
-  bool fallback_to_alt_source_url_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(ConfiguratorImpl);
 };
 
 }  // namespace component_updater
 
 #endif  // COMPONENTS_COMPONENT_UPDATER_CONFIGURATOR_IMPL_H_