Use FilePath::DirName instead of the deprecated file_util::GetDirectoryFromPath.

base/file_util_unittest.cc

 // 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.
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <winioctl.h>
 #include <shellapi.h>
@@ skipping 297 matching lines @@
   {L"/foo/bar/", L"/foo/bar"},
   {L"/foo/bar//", L"/foo/bar"},
   {L"/foo/bar", L"/foo"},
   {L"/foo/bar./", L"/foo/bar."},
   {L"/", L"/"},
   {L".", L"."},
   {L"..", L"."},  // yes, ".." technically lives in "."
 #endif
 };
 
-#if defined(OS_WIN)
-// This function is deprecated, and only exists on Windows anymore.
-TEST_F(FileUtilTest, GetDirectoryFromPath) {
-  for (unsigned int i = 0; i < arraysize(dir_cases); ++i) {
-    const dir_case& dir = dir_cases[i];
-    const std::wstring parent =
-        file_util::GetDirectoryFromPath(dir.full_path);
-    EXPECT_EQ(dir.directory, parent);
-  }
-}
-#endif
-
 // Flaky, http://crbug.com/46246
 TEST_F(FileUtilTest, FLAKY_CountFilesCreatedAfter) {
   // Create old file (that we don't want to count)
   FilePath old_file_name =
       temp_dir_.path().Append(FILE_PATH_LITERAL("Old File.txt"));
   CreateTextFile(old_file_name, L"Just call me Mr. Creakybits");
 
   // Age to perfection
 #if defined(OS_WIN)
   base::PlatformThread::Sleep(100);
@@ skipping 1476 matching lines @@
   EXPECT_TRUE(file_util::IsDirectoryEmpty(empty_dir));
 
   FilePath foo(empty_dir.Append(FILE_PATH_LITERAL("foo.txt")));
   std::string bar("baz");
   ASSERT_TRUE(file_util::WriteFile(foo, bar.c_str(), bar.length()));
 
   EXPECT_FALSE(file_util::IsDirectoryEmpty(empty_dir));
 }
 
 }  // namespace