Make InstallObserver methods not pure-virtual

chrome/browser/ui/app_list/search/app_result.h

 // Copyright 2013 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_SEARCH_APP_RESULT_H_
 #define CHROME_BROWSER_UI_APP_LIST_SEARCH_APP_RESULT_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 55 matching lines @@
       extensions::IconImage* image) OVERRIDE;
 
   // AppContextMenuDelegate overrides:
   virtual void ExecuteLaunchCommand(int event_flags) OVERRIDE;
 
   // ExtensionEnableFlowDelegate overrides:
   virtual void ExtensionEnableFlowFinished() OVERRIDE;
   virtual void ExtensionEnableFlowAborted(bool user_initiated) OVERRIDE;
 
   // extensions::InstallObserver overrides:
-  virtual void OnBeginExtensionInstall(
-      const ExtensionInstallParams& params) OVERRIDE;
-  virtual void OnDownloadProgress(const std::string& extension_id,
-                                  int percent_downloaded) OVERRIDE;
-  virtual void OnInstallFailure(const std::string& extension_id) OVERRIDE;
-  virtual void OnExtensionInstalled(
-      const extensions::Extension* extension) OVERRIDE;
   virtual void OnExtensionLoaded(
       const extensions::Extension* extension) OVERRIDE;
-  virtual void OnExtensionUnloaded(
-      const extensions::Extension* extension) OVERRIDE;
   virtual void OnExtensionUninstalled(
       const extensions::Extension* extension) OVERRIDE;
-  virtual void OnAppsReordered() OVERRIDE;
-  virtual void OnAppInstalledToAppList(
-      const std::string& extension_id) OVERRIDE;
   virtual void OnShutdown() OVERRIDE;
 
   Profile* profile_;
   const std::string app_id_;
   AppListControllerDelegate* controller_;
 
   bool is_platform_app_;
   scoped_ptr<extensions::IconImage> icon_;
   scoped_ptr<AppContextMenu> context_menu_;
   scoped_ptr<ExtensionEnableFlow> extension_enable_flow_;
 
   extensions::InstallTracker* install_tracker_;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(AppResult);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_SEARCH_APP_RESULT_H_