Clean up the file dev interfaces. The combination of some dev and some non

ppapi/cpp/dev/file_system_dev.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 PPAPI_CPP_DEV_FILE_SYSTEM_DEV_H_
 #define PPAPI_CPP_DEV_FILE_SYSTEM_DEV_H_
 
-#include "ppapi/c/dev/pp_file_info_dev.h"
-#include "ppapi/c/pp_instance.h"
-#include "ppapi/c/pp_stdint.h"
-#include "ppapi/c/pp_time.h"
-#include "ppapi/cpp/instance.h"
-#include "ppapi/cpp/resource.h"
-
-struct PP_FileInfo_Dev;
+#include "ppapi/cpp/file_system.h"
 
 namespace pp {
 
-class CompletionCallback;
-class FileRef_Dev;
-
-// Wraps methods from ppb_file_system.h
-class FileSystem_Dev : public Resource {
- public:
-  FileSystem_Dev(Instance* instance, PP_FileSystemType_Dev type);
-
-  int32_t Open(int64_t expected_size, const CompletionCallback& cc);
-};
+typedef FileSystem FileSystem_Dev;
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_FILE_SYSTEM_DEV_H_