Add extensions code to use common updater in components/update_client/

extensions/shell/browser/shell_extension_system.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 EXTENSIONS_SHELL_BROWSER_SHELL_EXTENSION_SYSTEM_H_
 #define EXTENSIONS_SHELL_BROWSER_SHELL_EXTENSION_SYSTEM_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 46 matching lines @@
   void RegisterExtensionWithRequestContexts(
       const Extension* extension,
       const base::Closure& callback) override;
   void UnregisterExtensionWithRequestContexts(
       const std::string& extension_id,
       const UnloadedExtensionInfo::Reason reason) override;
   const OneShotEvent& ready() const override;
   ContentVerifier* content_verifier() override;
   scoped_ptr<ExtensionSet> GetDependentExtensions(
       const Extension* extension) override;
+  void InstallUpdate(const std::string& extension_id,
+                     const base::FilePath& temp_dir) override;
 
  private:
   void OnExtensionRegisteredWithRequestContexts(
       scoped_refptr<Extension> extension);
   content::BrowserContext* browser_context_;  // Not owned.
 
   // Data to be accessed on the IO thread. Must outlive process_manager_.
   scoped_refptr<InfoMap> info_map_;
 
   scoped_ptr<ServiceWorkerManager> service_worker_manager_;
   scoped_ptr<RuntimeData> runtime_data_;
   scoped_ptr<QuotaService> quota_service_;
   scoped_ptr<AppSorting> app_sorting_;
 
   // Signaled when the extension system has completed its startup tasks.
   OneShotEvent ready_;
 
   base::WeakPtrFactory<ShellExtensionSystem> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellExtensionSystem);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_SHELL_BROWSER_SHELL_EXTENSION_SYSTEM_H_