Remove InstallTracker's extension load, unload observer

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

Index: chrome/browser/ui/app_list/search/app_result.h
diff --git a/chrome/browser/ui/app_list/search/app_result.h b/chrome/browser/ui/app_list/search/app_result.h
index 061d17cca0f84d67d069620af92aac3a0a671633..285998a3401a5ed62ff664fde5b8a7fd2d0f8aa4 100644
--- a/chrome/browser/ui/app_list/search/app_result.h
+++ b/chrome/browser/ui/app_list/search/app_result.h
@@ -8,18 +8,19 @@
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
+#include "base/scoped_observer.h"
 #include "chrome/browser/extensions/extension_icon_image.h"
-#include "chrome/browser/extensions/install_observer.h"
 #include "chrome/browser/ui/app_list/app_context_menu_delegate.h"
 #include "chrome/browser/ui/app_list/search/chrome_search_result.h"
 #include "chrome/browser/ui/extensions/extension_enable_flow_delegate.h"
+#include "extensions/browser/extension_registry_observer.h"
 
 class AppListControllerDelegate;
 class ExtensionEnableFlow;
 class Profile;
 
 namespace extensions {
-class InstallTracker;
+class ExtensionRegistry;
 }
 
 namespace app_list {
@@ -32,7 +33,7 @@ class AppResult : public ChromeSearchResult,
                   public extensions::IconImage::Observer,
                   public AppContextMenuDelegate,
                   public ExtensionEnableFlowDelegate,
-                  public extensions::InstallObserver {
+                  public extensions::ExtensionRegistryObserver {
  public:
   AppResult(Profile* profile,
             const std::string& app_id,
@@ -50,9 +51,6 @@ class AppResult : public ChromeSearchResult,
   virtual ChromeSearchResultType GetType() OVERRIDE;
 
  private:
-  void StartObservingInstall();
-  void StopObservingInstall();
-
   // Checks if extension is disabled and if enable flow should be started.
   // Returns true if extension enable flow is started or there is already one
   // running.
@@ -72,24 +70,27 @@ class AppResult : public ChromeSearchResult,
   virtual void ExtensionEnableFlowFinished() OVERRIDE;
   virtual void ExtensionEnableFlowAborted(bool user_initiated) OVERRIDE;
 
-  // extensions::InstallObserver overrides:
+  // extensions::ExtensionRegistryObserver override:
   virtual void OnExtensionLoaded(
+      content::BrowserContext* browser_context,
       const extensions::Extension* extension) OVERRIDE;
   virtual void OnExtensionUninstalled(
+      content::BrowserContext* browser_context,
       const extensions::Extension* extension) OVERRIDE;
-  virtual void OnShutdown() OVERRIDE;
 
   Profile* profile_;
   const std::string app_id_;
   AppListControllerDelegate* controller_;
 
+  ScopedObserver<extensions::ExtensionRegistry,
+                 extensions::ExtensionRegistryObserver>
+      extension_registry_observer_;
+
   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);
 };