On windows filepaths need \\?\ prefix to allow extended file path names. Fix ...

webkit/fileapi/file_system_path_manager.h

 // Copyright (c) 2010 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_FILEAPI_FILE_SYSTEM_PATH_MANAGER_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_PATH_MANAGER_H_
 
 #include <map>
 
 #include "base/callback.h"
@@ skipping 10 matching lines @@
 namespace fileapi {
 
 class FileSystemPathManager {
  public:
   FileSystemPathManager(scoped_refptr<base::MessageLoopProxy> file_message_loop,
                         const FilePath& profile_path,
                         bool is_incognito,
                         bool allow_file_access_from_files);
   ~FileSystemPathManager();
 
+  static FilePath GetFileSystemCommonRootDirectory(const FilePath& root_path);
+
   // Callback for GetFileSystemRootPath.
   // If the request is accepted and the root filesystem for the origin exists
   // the callback is called with success=true and valid root_path and name.
   // If the request is accepted, |create| is specified for
   // GetFileSystemRootPath, and the root directory does not exist, it creates
   // a new one and calls back with success=true if the creation has succeeded.
   typedef Callback3<bool /* success */,
                     const FilePath& /* root_path */,
                     const std::string& /* name */>::Type GetRootPathCallback;
 
@@ skipping 44 matching lines @@
   const FilePath base_path_;
   const bool is_incognito_;
   const bool allow_file_access_from_files_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemPathManager);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_PATH_MANAGER_H_