Refactor FileIO to the new design

ppapi/tests/test_file_io.cc

 // 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.
 
 #include "ppapi/tests/test_file_io.h"
 
 #include <string.h>
 
 #include <vector>
 
@@ skipping 1123 matching lines @@
   if (rv == PP_OK_COMPLETIONPENDING)
     rv = callback.WaitForResult();
   if (rv != PP_OK)
     return ReportError("FileIO::Open", rv);
 
   const PPB_FileIOTrusted* trusted = static_cast<const PPB_FileIOTrusted*>(
       pp::Module::Get()->GetBrowserInterface(PPB_FILEIOTRUSTED_INTERFACE));
   if (!trusted)
     return ReportError("FileIOTrusted", PP_ERROR_FAILED);
 
-  // Get file descriptor. This is only supported in-process for now, so don't
-  // test out of process.
-  const PPB_Testing_Dev* testing_interface = GetTestingInterface();
-  if (testing_interface && !testing_interface->IsOutOfProcess()) {
-    int32_t fd = trusted->GetOSFileDescriptor(file_io.pp_resource());
-    if (fd < 0)
-      return "FileIO::GetOSFileDescriptor() returned a bad file descriptor.";
-  }
-
   // Calling WillWrite.
   rv = trusted->WillWrite(
       file_io.pp_resource(), 0, 9,
       static_cast<pp::CompletionCallback>(callback).pp_completion_callback());
   if (rv == PP_OK_COMPLETIONPENDING)
     rv = callback.WaitForResult();
   if (rv != 9)
     return ReportError("WillWrite", rv);
 
   // Writing the actual data.
@@ skipping 132 matching lines @@
     rv = callback.WaitForResult();
   if ((invalid_combination && rv == PP_OK) ||
       (!invalid_combination && ((rv == PP_OK) != create_if_doesnt_exist))) {
     return ReportOpenError(open_flags);
   }
 
   return std::string();
 }
 
 // TODO(viettrungluu): Test Close(). crbug.com/69457