Move ExtensionSystem into extensions namespace

chrome/browser/profiles/profile_impl.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.
 
 // This class gathers state related to a single user profile.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 #pragma once
 
 #include <string>
 
 #include "base/file_path.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/timer.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_impl_io_data.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class ExtensionNavigationObserver;
-class ExtensionSystem;
 class NetPrefObserver;
 class PrefService;
 class SSLConfigServiceManager;
 class VisitedLinkEventListener;
 
 #if defined(ENABLE_PROMO_RESOURCE_SERVICE)
 class PromoResourceService;
 #endif
 
 #if defined(OS_CHROMEOS)
 namespace chromeos {
 class EnterpriseExtensionObserver;
 class LocaleChangeGuard;
 class Preferences;
 }
 #endif
 
 namespace content {
 class SpeechRecognitionPreferences;
 }
 
+namespace extensions {
+class ExtensionSystem;
+}
+
 // The default profile implementation.
 class ProfileImpl : public Profile,
                     public content::NotificationObserver {
  public:
   virtual ~ProfileImpl();
 
   static void RegisterUserPrefs(PrefService* prefs);
 
   // content::BrowserContext implementation:
   virtual FilePath GetPath() OVERRIDE;
@@ skipping 209 matching lines @@
   Profile::Delegate* delegate_;
 
   chrome_browser_net::Predictor* predictor_;
 
   bool session_restore_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileImpl);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_