Remove InstallTracker's extension installed, uninstalled observers.

chrome/browser/ui/app_list/extension_app_model_builder.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_UI_APP_LIST_EXTENSION_APP_MODEL_BUILDER_H_
 #define CHROME_BROWSER_UI_APP_LIST_EXTENSION_APP_MODEL_BUILDER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 34 matching lines @@
   virtual ~ExtensionAppModelBuilder();
 
   // Initialize to use app-list sync and sets |service_| to |service|.
   void InitializeWithService(app_list::AppListSyncableService* service);
 
   // Initialize to use extension sync and sets |service_| to NULL. Used in
   // tests and when AppList sync is not enabled.
   void InitializeWithProfile(Profile* profile, app_list::AppListModel* model);
 
  private:
-  using extensions::InstallObserver::OnExtensionUninstalled;
   typedef std::vector<ExtensionAppItem*> ExtensionAppList;
 
   // Builds the model with the current profile.
   void BuildModel();
 
   // extensions::InstallObserver.
   virtual void OnBeginExtensionInstall(
       const ExtensionInstallParams& params) OVERRIDE;
   virtual void OnDownloadProgress(const std::string& extension_id,
                                   int percent_downloaded) OVERRIDE;
@@ skipping 80 matching lines @@
   // We listen to this to show app installing progress.
   extensions::InstallTracker* tracker_;
 
   // Listen extension's load, unload, uninstalled.
   extensions::ExtensionRegistry* extension_registry_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionAppModelBuilder);
 };
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_EXTENSION_APP_MODEL_BUILDER_H_