Move DirectoryReader::ReadEntries to FileRef::ReadDirectoryEntries

ppapi/tests/test_directory_reader.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 PAPPI_TESTS_TEST_DIRECTORY_READER_H_
-#define PAPPI_TESTS_TEST_DIRECTORY_READER_H_
-
-#include <string>
-
-#include "ppapi/tests/test_case.h"
-
-namespace pp {
-class FileRef;
-}
-
-class TestDirectoryReader : public TestCase {
- public:
-  explicit TestDirectoryReader(TestingInstance* instance)
-      : TestCase(instance) {}
-
-  // TestCase implementation.
-  virtual bool Init();
-  virtual void RunTests(const std::string& filter);
-
- private:
-  int32_t DeleteDirectoryRecursively(pp::FileRef*);
-
-  std::string TestReadEntries();
-};
-
-#endif  // PAPPI_TESTS_TEST_DIRECTORY_READER_H_