Revert 87415 - Convert more interfaces to the new thunk system. This goes up to and including

ppapi/thunk/ppb_file_system_thunk.cc

-// 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.
-
-#include "ppapi/c/dev/ppb_file_system_dev.h"
-#include "ppapi/c/pp_completion_callback.h"
-#include "ppapi/c/pp_errors.h"
-#include "ppapi/thunk/thunk.h"
-#include "ppapi/thunk/enter.h"
-#include "ppapi/thunk/ppb_file_system_api.h"
-#include "ppapi/thunk/resource_creation_api.h"
-
-namespace ppapi {
-namespace thunk {
-
-namespace {
-
-PP_Resource Create(PP_Instance instance, PP_FileSystemType_Dev type) {
-  EnterFunction<ResourceCreationAPI> enter(instance, true);
-  if (enter.failed())
-    return 0;
-  return enter.functions()->CreateFileSystem(instance, type);
-}
-
-PP_Bool IsFileSystem(PP_Resource resource) {
-  EnterResource<PPB_FileSystem_API> enter(resource, false);
-  return PP_FromBool(enter.succeeded());
-}
-
-int32_t Open(PP_Resource file_system,
-             int64 expected_size,
-             PP_CompletionCallback callback) {
-  EnterResource<PPB_FileSystem_API> enter(file_system, true);
-  if (enter.failed())
-    return PP_ERROR_BADRESOURCE;
-  return enter.object()->Open(expected_size, callback);
-}
-
-PP_FileSystemType_Dev GetType(PP_Resource file_system) {
-  EnterResource<PPB_FileSystem_API> enter(file_system, true);
-  if (enter.failed())
-    return PP_FILESYSTEMTYPE_INVALID;
-  return enter.object()->GetType();
-}
-
-const PPB_FileSystem_Dev g_ppb_file_system_thunk = {
-  &Create,
-  &IsFileSystem,
-  &Open,
-  &GetType
-};
-
-}  // namespace
-
-const PPB_FileSystem_Dev* GetPPB_FileSystem_Thunk() {
-  return &g_ppb_file_system_thunk;
-}
-
-}  // namespace thunk
-}  // namespace ppapi