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

chrome/browser/extensions/test_extension_system.cc

 // 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.
 
 #include "chrome/browser/extensions/test_extension_system.h"
 
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/extensions/blacklist.h"
 #include "chrome/browser/extensions/chrome_app_sorting.h"
@@ skipping 109 matching lines @@
 ContentVerifier* TestExtensionSystem::content_verifier() {
   return NULL;
 }
 
 scoped_ptr<ExtensionSet> TestExtensionSystem::GetDependentExtensions(
     const Extension* extension) {
   return extension_service()->shared_module_service()->GetDependentExtensions(
       extension);
 }
 
+void TestExtensionSystem::InstallUpdate(const std::string& extension_id,
+                                        const base::FilePath& temp_dir) {
+  NOTREACHED();
+}
+
 // static
 scoped_ptr<KeyedService> TestExtensionSystem::Build(
     content::BrowserContext* profile) {
   return make_scoped_ptr(
       new TestExtensionSystem(static_cast<Profile*>(profile)));
 }
 
 void TestExtensionSystem::RecreateAppSorting() {
   app_sorting_.reset(new ChromeAppSorting(profile_));
 }
 
 }  // namespace extensions