Move ExtensionPrefs and friends to extensions/ directory.

apps/shell/shell_extension_system.cc

 // Copyright 2013 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.
 
 #include "apps/shell/shell_extension_system.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "chrome/browser/chrome_notification_types.h"
-#include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/common/extensions/extension_file_util.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "extensions/browser/event_router.h"
+#include "extensions/browser/extension_prefs.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/info_map.h"
 #include "extensions/browser/lazy_background_task_queue.h"
 #include "extensions/browser/process_manager.h"
 
 using content::BrowserContext;
 using content::BrowserThread;
 
 namespace extensions {
 
@@ skipping 120 matching lines @@
 void ShellExtensionSystem::UnregisterExtensionWithRequestContexts(
     const std::string& extension_id,
     const UnloadedExtensionInfo::Reason reason) {
 }
 
 const OneShotEvent& ShellExtensionSystem::ready() const {
   return ready_;
 }
 
 }  // namespace extensions