iwyu: Include callback_old.h where appropriate, final.

BUG=82098
TEST=none

Review URL: http://codereview.chromium.org/7003003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@85003 0039d316-1c4b-4281-b951-d872f2087c98
STDMETHODIMP UrlmonUrlRequest::Authenticate(HWND* parent_window,
                                            LPWSTR* user_name,
                                            LPWSTR* password) {
  if (!parent_window)
    return E_INVALIDARG;

  if (privileged_mode_)
    return E_ACCESSDENIED;

  DCHECK(::IsWindow(parent_window_));
  *parent_window = parent_window_;
  return S_OK;
}

STDMETHODIMP UrlmonUrlRequest::Authenticate(HWND* parent_window,
                                            LPWSTR* user_name,
                                            LPWSTR* password) {
  if (!parent_window)
    return E_INVALIDARG;

  if (privileged_mode_)
    return E_ACCESSDENIED;

  DCHECK(::IsWindow(parent_window_));
  *parent_window = parent_window_;
  return S_OK;
}
