Make InstallObserver methods not pure-virtual

chrome/browser/ui/app_list/recommended_apps.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_RECOMMENDED_APPS_H_
 #define CHROME_BROWSER_UI_APP_LIST_RECOMMENDED_APPS_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 19 matching lines @@
 
   void AddObserver(RecommendedAppsObserver* observer);
   void RemoveObserver(RecommendedAppsObserver* observer);
 
   const Apps& apps() const { return apps_; }
 
  private:
   void Update();
 
   // 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_;
   PrefChangeRegistrar pref_change_registrar_;
 
   Apps apps_;
   ObserverList<RecommendedAppsObserver, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(RecommendedApps);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_RECOMMENDED_APPS_H_