Cleanup: Remove unneeded forward declarations in webkit/.

webkit/chromeos/fileapi/file_access_permissions.h

 // Copyright (c) 2011 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 WEBKIT_CHROMEOS_FILEAPI_FILE_ACCESS_PERMISSIONS_H_
 #define WEBKIT_CHROMEOS_FILEAPI_FILE_ACCESS_PERMISSIONS_H_
 #pragma once
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/file_path.h"
 #include "base/synchronization/lock.h"
 
-class Extension;
-
 namespace chromeos {
 
 class FileAccessPermissions {
  public:
   FileAccessPermissions();
   virtual ~FileAccessPermissions();
 
   // Grants |extension_id| access to |path|.
   void GrantAccessPermission(const std::string& extension_id,
                              const FilePath& path);
   // Checks id |extension_id| has permission to access to |path|.
   bool HasAccessPermission(const std::string& extension_id,
                            const FilePath& path);
   // Revokes all file permissions for |extension_id|.
   void RevokePermissions(const std::string& extension_id);
 
  private:
   typedef std::set<FilePath> PathSet;
   typedef std::map<std::string, PathSet> PathAccessMap;
 
   base::Lock lock_;  // Synchronize all access to path_map_.
   PathAccessMap path_map_;
 };
 
-};
+}  // namespace chromeos
 
 #endif  // WEBKIT_CHROMEOS_FILEAPI_FILE_ACCESS_PERMISSIONS_H_