Remove InstallTracker's extension load, unload observer

chrome/browser/ui/app_list/extension_app_model_builder.h

Index: chrome/browser/ui/app_list/extension_app_model_builder.h
diff --git a/chrome/browser/ui/app_list/extension_app_model_builder.h b/chrome/browser/ui/app_list/extension_app_model_builder.h
index 76585e4e14b9f160f1569d47398938e0da430604..2e9a54dbaa159cad842b8d8138e7c3385ca08833 100644
--- a/chrome/browser/ui/app_list/extension_app_model_builder.h
+++ b/chrome/browser/ui/app_list/extension_app_model_builder.h
@@ -10,7 +10,9 @@
 
 #include "base/gtest_prod_util.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"
 #include "ui/app_list/app_list_model.h"
 #include "ui/base/models/list_model_observer.h"
 
@@ -24,6 +26,7 @@ class AppListSyncableService;
 
 namespace extensions {
 class Extension;
+class ExtensionRegistry;
 class ExtensionSet;
 class InstallTracker;
 }
@@ -35,6 +38,7 @@ class ImageSkia;
 // This class populates and maintains the given |model| with information from
 // |profile|.
 class ExtensionAppModelBuilder : public extensions::InstallObserver,
+                                 public extensions::ExtensionRegistryObserver,
                                  public app_list::AppListItemListObserver {
  public:
   explicit ExtensionAppModelBuilder(AppListControllerDelegate* controller);
@@ -53,25 +57,31 @@ class ExtensionAppModelBuilder : public extensions::InstallObserver,
   // Builds the model with the current profile.
   void BuildModel();
 
-  // extensions::InstallObserver
+  // extensions::InstallObserver.
   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 OnExtensionLoaded(
-      const extensions::Extension* extension) OVERRIDE;
-  virtual void OnExtensionUnloaded(
-      const extensions::Extension* extension) OVERRIDE;
-  virtual void OnExtensionUninstalled(
-      const extensions::Extension* extension) OVERRIDE;
   virtual void OnDisabledExtensionUpdated(
       const extensions::Extension* extension) OVERRIDE;
   virtual void OnAppInstalledToAppList(
       const std::string& extension_id) OVERRIDE;
   virtual void OnShutdown() OVERRIDE;
 
-  // AppListItemListObserver
+  // extensions::ExtensionRegistryObserver.
+  virtual void OnExtensionLoaded(
+      content::BrowserContext* browser_context,
+      const extensions::Extension* extension) OVERRIDE;
+  virtual void OnExtensionUnloaded(
+      content::BrowserContext* browser_context,
+      const extensions::Extension* extension,
+      extensions::UnloadedExtensionInfo::Reason reason) OVERRIDE;
+  virtual void OnExtensionUninstalled(
+      content::BrowserContext* browser_context,
+      const extensions::Extension* extension) OVERRIDE;
+
+  // AppListItemListObserver.
   virtual void OnListItemMoved(size_t from_index,
                                size_t to_index,
                                app_list::AppListItem* item) OVERRIDE;
@@ -134,6 +144,11 @@ class ExtensionAppModelBuilder : public extensions::InstallObserver,
   // We listen to this to show app installing progress.
   extensions::InstallTracker* tracker_;
 
+  // Listen extension's load, unload, uninstalled.
+  ScopedObserver<extensions::ExtensionRegistry,
+                 extensions::ExtensionRegistryObserver>
+      extension_registry_observer_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionAppModelBuilder);
 };