[Extensions] Migrate ExtensionInstallPrompt::Delegate to be a callback

chrome/browser/extensions/navigation_observer.h

 // Copyright (c) 2012 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_EXTENSIONS_NAVIGATION_OBSERVER_H_
 #define CHROME_BROWSER_EXTENSIONS_NAVIGATION_OBSERVER_H_
 
 #include <set>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class Profile;
 
 namespace content {
 class NavigationController;
 }
 
 namespace extensions {
 
 // The NavigationObserver listens to navigation notifications. If the user
 // navigates into an extension that has been disabled due to a permission
 // increase, it prompts the user to accept the new permissions and re-enables
 // the extension.
-class NavigationObserver : public ExtensionInstallPrompt::Delegate,
-                           public content::NotificationObserver {
+class NavigationObserver : public content::NotificationObserver {
  public:
   explicit NavigationObserver(Profile* profile);
   ~NavigationObserver() override;
 
   // content::NotificationObserver
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
  private:
   // Registers for the NOTIFICATION_NAV_ENTRY_COMMITTED notification.
   void RegisterForNotifications();
 
   // Checks if |nav_controller| has entered an extension's web extent. If it
   // has and the extension is disabled due to a permissions increase, this
   // prompts the user to accept the new permissions and enables the extension.
   void PromptToEnableExtensionIfNecessary(
       content::NavigationController* nav_controller);
 
-  // ExtensionInstallPrompt::Delegate callbacks used for the permissions prompt.
-  void InstallUIProceed() override;
-  void InstallUIAbort(bool user_initiated) override;
+  void OnInstallPromptDone(ExtensionInstallPrompt::Result result);
 
   content::NotificationRegistrar registrar_;
 
   Profile* profile_;
 
   // The UI used to confirm enabling extensions.
   scoped_ptr<ExtensionInstallPrompt> extension_install_prompt_;
 
   // The data we keep track of when prompting to enable extensions.
   std::string in_progress_prompt_extension_id_;
   content::NavigationController* in_progress_prompt_navigation_controller_;
 
   // The extension ids we've already prompted the user about.
   std::set<std::string> prompted_extensions_;
 
+  base::WeakPtrFactory<NavigationObserver> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(NavigationObserver);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_NAVIGATION_OBSERVER_H_