Make the shmem-specific functions in file_util.h POSIX-only.

base/file_util_unittest.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 "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #include <shlobj.h>
@@ skipping 1673 matching lines @@
   FilePath new_dir;
   ASSERT_TRUE(CreateTemporaryDirInDir(
                   temp_dir_.path(),
                   FILE_PATH_LITERAL("CreateNewTemporaryDirInDirTest"),
                   &new_dir));
   EXPECT_TRUE(PathExists(new_dir));
   EXPECT_TRUE(temp_dir_.path().IsParent(new_dir));
   EXPECT_TRUE(DeleteFile(new_dir, false));
 }
 
+#if defined(OS_POSIX)
 TEST_F(FileUtilTest, GetShmemTempDirTest) {
   FilePath dir;
   EXPECT_TRUE(GetShmemTempDir(false, &dir));
   EXPECT_TRUE(DirectoryExists(dir));
 }
+#endif
 
 TEST_F(FileUtilTest, GetHomeDirTest) {
 #if !defined(OS_ANDROID)  // Not implemented on Android.
   // We don't actually know what the home directory is supposed to be without
   // calling some OS functions which would just duplicate the implementation.
   // So here we just test that it returns something "reasonable".
   FilePath home = GetHomeDir();
   ASSERT_FALSE(home.empty());
   ASSERT_TRUE(home.IsAbsolute());
 #endif
@@ skipping 795 matching lines @@
   // Trying to close it should crash. This is important for security.
   EXPECT_DEATH(CloseWithScopedFD(fds[1]), "");
 #endif
 }
 
 #endif  // defined(OS_POSIX)
 
 }  // namespace
 
 }  // namespace base