ExtensionUpdater: Abstract ExtensionDownloader creation

chrome/browser/extensions/extension_service.h

 // Copyright (c) 2012 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_EXTENSION_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 31 matching lines @@
 }
 
 namespace content {
 class DevToolsAgentHost;
 }
 
 namespace extensions {
 class ComponentLoader;
 class CrxInstaller;
 class ExtensionActionStorageManager;
+class ExtensionDownloader;
+class ExtensionDownloaderDelegate;
 class ExtensionErrorController;
 class ExtensionRegistry;
 class ExtensionSystem;
 class ExtensionUpdater;
 class OneShotEvent;
 class ExternalInstallManager;
 class SharedModuleService;
 class UpdateObserver;
 }  // namespace extensions
 
@@ skipping 391 matching lines @@
 
   // Set a callback to be called when all external providers are ready and their
   // extensions have been installed.
   void set_external_updates_finished_callback_for_test(
       const base::Closure& callback) {
     external_updates_finished_callback_ = callback;
   }
 
 
  private:
+  // Creates an ExtensionDownloader for use by the updater.
+  scoped_ptr<extensions::ExtensionDownloader> CreateExtensionDownloader(
+      extensions::ExtensionDownloaderDelegate* delegate);
+
   // Reloads the specified extension, sending the onLaunched() event to it if it
   // currently has any window showing. |be_noisy| determines whether noisy
   // failures are allowed for unpacked extension installs.
   void ReloadExtensionImpl(const std::string& extension_id, bool be_noisy);
 
   // content::NotificationObserver implementation:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
@@ skipping 255 matching lines @@
                            GreylistedExtensionDisabled);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            GreylistDontEnableManuallyDisabled);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            GreylistUnknownDontChange);
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionService);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_