They were disabled during the Chromium 61 upgrade. Fix them and enable.

/cc @alespergl 
atom/common/api/atom_api_native_image.cc
base::FilePath asar_path, relative_path;
  base::FilePath image_path(path);
  if (asar::GetAsarArchivePath(image_path, &asar_path, &relative_path)) {
    std::shared_ptr<asar::Archive> archive =
        asar::GetOrCreateAsarArchive(asar_path);
    if (archive)
      archive->CopyFileOut(relative_path, &image_path);
  }
  
  return base::win::ScopedHICON(static_cast<HICON>(
      LoadImage(NULL, image_path.value().c_str(), IMAGE_ICON, size, size,
                LR_LOADFROMFILE)));
}
bool ReadImageSkiaFromICO(gfx::ImageSkia* image, HICON icon) {
  
  std::unique_ptr<SkBitmap> bitmap(IconUtil::CreateSkBitmapFromHICON(icon));
  if (!bitmap)
    return false;
  image->AddRepresentation(gfx::ImageSkiaRep(*bitmap, 1.0f));
  return true;
}
#endif
void Noop(char*, void*) {