Move each permission classes to its own files in extensions/permissions

chrome/browser/extensions/api/permissions/permissions_api_helpers.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_API_PERMISSIONS_PERMISSIONS_API_HELPERS_H_
 #define CHROME_BROWSER_EXTENSIONS_API_PERMISSIONS_PERMISSIONS_API_HELPERS_H_
 #pragma once
 
 #include <string>
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/ref_counted.h"
 
 namespace base {
 class DictionaryValue;
 }
 
-class ExtensionPermissionSet;
+
 
 namespace extensions {
 
+class PermissionSet;
+
 namespace api {
 namespace permissions {
 struct Permissions;
 }
 }
 
 namespace permissions_api_helpers {
 
 // Converts the permission |set| to a permissions object.
 scoped_ptr<api::permissions::Permissions> PackPermissionSet(
-    const ExtensionPermissionSet* set);
+    const PermissionSet* set);
 
 // Creates a permission set from |permissions|. Returns NULL if the permissions
 // cannot be converted to a permission set, in which case |error| will be set.
-scoped_refptr<ExtensionPermissionSet> UnpackPermissionSet(
+scoped_refptr<PermissionSet> UnpackPermissionSet(
     const api::permissions::Permissions& permissions, std::string* error);
 
 }  // namespace permissions_api_helpers
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_PERMISSIONS_PERMISSIONS_API_HELPERS_H_