Move small c/b/extensions classes into extensions namespace no.2

chrome/browser/extensions/extension_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_EXTENSION_NAVIGATION_OBSERVER_H_
-#define CHROME_BROWSER_EXTENSIONS_EXTENSION_NAVIGATION_OBSERVER_H_
-
-#include <set>
-#include <string>
-
-#include "base/memory/scoped_ptr.h"
-#include "chrome/browser/extensions/extension_install_prompt.h"
-#include "content/public/browser/notification_registrar.h"
-
-class Profile;
-
-namespace content {
-class NavigationController;
-}
-
-// The ExtensionNavigationObserver 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 ExtensionNavigationObserver : public ExtensionInstallPrompt::Delegate,
-                                    public content::NotificationObserver {
- public:
-  explicit ExtensionNavigationObserver(Profile* profile);
-  virtual ~ExtensionNavigationObserver();
-
-  // content::NotificationObserver
-  virtual 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.
-  virtual void InstallUIProceed() OVERRIDE;
-  virtual void InstallUIAbort(bool user_initiated) OVERRIDE;
-
-  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_;
-};
-
-#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_NAVIGATION_OBSERVER_H_