Move ExtensionPrefs and friends to extensions/ directory.

chrome/browser/extensions/chrome_app_sorting.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_CHROME_APP_SORTING_H_
 #define CHROME_BROWSER_EXTENSIONS_CHROME_APP_SORTING_H_
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
-#include "chrome/browser/extensions/extension_prefs.h"
 #include "extensions/browser/app_sorting.h"
+#include "extensions/browser/extension_prefs.h"
 #include "extensions/common/extension.h"
 #include "sync/api/string_ordinal.h"
 
 class ExtensionSyncService;
 class PrefService;
 
 namespace extensions {
 
 class ExtensionScopedPrefs;
 
@@ skipping 152 matching lines @@
 
   // The set of extensions that don't appear in the new tab page.
   std::set<std::string> ntp_hidden_extensions_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeAppSorting);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_CHROME_APP_SORTING_H_