PVS-Studio warning V540 for Chromium

bool TestShell::PromptForSaveFile(const wchar_t* prompt_title,
                                  FilePath* result) {
  ...
  OPENFILENAME info = {0};
  ...
  info.lpstrFilter = L"*.txt";
  ...
}

This suspicious code was found in Chromium project by PVS-Studio static code analyzer.
Warning message is:
V540 Member 'lpstrFilter' should point to string terminated by two 0 characters.  test_shell_common  test_shell_win.cc  643

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