Make sure the Commands list correctly reflects the status of extensions right after install/uninsta…

chrome/browser/ui/webui/extensions/command_handler.h

Index: chrome/browser/ui/webui/extensions/command_handler.h
===================================================================
--- chrome/browser/ui/webui/extensions/command_handler.h	(revision 153186)
+++ chrome/browser/ui/webui/extensions/command_handler.h	(working copy)
@@ -6,6 +6,8 @@
 #define CHROME_BROWSER_UI_WEBUI_EXTENSIONS_COMMAND_HANDLER_H_
 
 #include "base/compiler_specific.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_ui_message_handler.h"
 
 namespace base {
@@ -19,13 +21,15 @@
 }
 
 class Extension;
+class Profile;
 
 namespace extensions {
 
 // The handler page for the Extension Commands UI overlay.
-class CommandHandler : public content::WebUIMessageHandler {
+class CommandHandler : public content::WebUIMessageHandler,
+                       public content::NotificationObserver {
  public:
-  CommandHandler();
+  explicit CommandHandler(Profile* profile);
   virtual ~CommandHandler();
 
   // Fetches the localized values for the page and deposits them into
@@ -35,6 +39,11 @@
   // WebUIMessageHandler implementation.
   virtual void RegisterMessages() OVERRIDE;
 
+  // NotificationObserver implementation.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
  private:
    // Update the list of extension commands in the config UI.
   void UpdateCommandDataOnPage();
@@ -56,6 +65,10 @@
   // |commands|.
   void GetAllCommands(base::DictionaryValue* commands);
 
+  content::NotificationRegistrar registrar_;
+
+  Profile* profile_;
+
   DISALLOW_COPY_AND_ASSIGN(CommandHandler);
 };