Revert of Move file_handlers API from //chrome to //extensions

extensions/browser/api/file_handlers/directory_util_unittest.cc

-// Copyright 2016 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 "extensions/browser/api/file_handlers/directory_util.h"
-
-#include <memory>
-#include <set>
-#include <string>
-#include <vector>
-
-#include "base/files/file_path.h"
-#include "base/files/file_util.h"
-#include "base/run_loop.h"
-#include "content/public/browser/browser_thread.h"
-#include "content/public/test/test_browser_context.h"
-#include "content/public/test/test_browser_thread_bundle.h"
-#include "content/public/test/test_utils.h"
-#include "extensions/browser/api/extensions_api_client.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace extensions {
-namespace app_file_handler_util {
-namespace {
-
-const char kRandomPath[] = "/random/path";
-
-void OnCollectForEntriesPath(
-    std::set<base::FilePath>* output,
-    std::unique_ptr<std::set<base::FilePath>> path_directory_set) {
-  *output = *path_directory_set;
-}
-
-}  // namespace
-
-class IsDirectoryUtilTest : public testing::Test {
- protected:
-  IsDirectoryUtilTest() {}
-  ~IsDirectoryUtilTest() override {}
-
-  void SetUp() override {
-    EXPECT_TRUE(
-        base::CreateNewTempDirectory(base::FilePath::StringType(), &dir_path_));
-    EXPECT_TRUE(base::CreateTemporaryFile(&file_path_));
-  }
-
-  content::TestBrowserThreadBundle thread_bundle_;
-  ExtensionsAPIClient extensions_api_client_;
-  content::TestBrowserContext context_;
-  base::FilePath dir_path_;
-  base::FilePath file_path_;
-};
-
-TEST_F(IsDirectoryUtilTest, CollectForEntriesPaths) {
-  std::vector<base::FilePath> paths;
-  paths.push_back(dir_path_);
-  paths.push_back(file_path_);
-  paths.push_back(base::FilePath::FromUTF8Unsafe(kRandomPath));
-
-  IsDirectoryCollector collector(&context_);
-  std::set<base::FilePath> result;
-  collector.CollectForEntriesPaths(
-      paths, base::Bind(&OnCollectForEntriesPath, &result));
-  content::RunAllBlockingPoolTasksUntilIdle();
-
-  ASSERT_EQ(1u, result.size());
-  EXPECT_GT(result.count(dir_path_), 0u);
-}
-
-}  // namespace app_file_handler_util
-}  // namespace extensions