Remove InstallTracker's extension load, unload observer

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"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "base/prefs/pref_change_registrar.h"
+#include "base/scoped_observer.h"
 #include "chrome/browser/extensions/install_observer.h"
+#include "extensions/browser/extension_registry_observer.h"
 
 class Profile;
 
+namespace extensions {
+class ExtensionRegistry;
+}
+
 namespace app_list {
 
 class RecommendedAppsObserver;
 
 // A class that maintains a list of recommended apps by watching changes
 // to app state.
-class RecommendedApps : public extensions::InstallObserver {
+class RecommendedApps : public extensions::ExtensionRegistryObserver {
  public:
   typedef std::vector<scoped_refptr<const extensions::Extension> > Apps;
 
   explicit RecommendedApps(Profile* profile);
   virtual ~RecommendedApps();
 
   void AddObserver(RecommendedAppsObserver* observer);
   void RemoveObserver(RecommendedAppsObserver* observer);
 
   const Apps& apps() const { return apps_; }
 
  private:
   void Update();
 
   // extensions::InstallObserver overrides:
-  virtual void OnExtensionInstalled(
+  virtual void OnExtensionLoaded(
+      content::BrowserContext* browser_context,
       const extensions::Extension* extension) OVERRIDE;
-  virtual void OnExtensionLoaded(
-      const extensions::Extension* extension) OVERRIDE;
-  virtual void OnExtensionUnloaded(
-      const extensions::Extension* extension) OVERRIDE;
+  virtual void OnExtensionWillBeInstalled(
+      content::BrowserContext* browser_context,
+      const extensions::Extension* extension,
+      bool is_update,
+      bool from_ephemeral,
+      const std::string& old_name) OVERRIDE;
   virtual void OnExtensionUninstalled(
+      content::BrowserContext* browser_context,
       const extensions::Extension* extension) OVERRIDE;
 
   Profile* profile_;
   PrefChangeRegistrar pref_change_registrar_;
 
   Apps apps_;
   ObserverList<RecommendedAppsObserver, true> observers_;
 
+  ScopedObserver<extensions::ExtensionRegistry,
+                 extensions::ExtensionRegistryObserver>
+      extension_registry_observer_;
+
   DISALLOW_COPY_AND_ASSIGN(RecommendedApps);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_RECOMMENDED_APPS_H_