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### Preflight Checklist
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* [ ] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
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### Problem Description
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when calling webContents.getPrinters(), printer status does not determine whether the printer is online or offline.

### Proposed Solution
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### Alternatives Considered
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### Additional Information
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shell/browser/api/atom_api_web_contents.cc
frame_subscriber_.reset();
}
void Ws::StartDrag(const gin_helper::Dictionary& item,
                            gin_helper::Arguments* args) {
  base::FilePath file;
  std::vector<base::FilePath> files;
  if (!item.Get("files", &files) && item.Get("file", &file)) {
    files.push_back(file);
  }
  gin::Handle<NativeImage> icon;
  if (!item.Get("icon", &icon)) {
    args->ThrowError("Must specify non-empty 'icon' option");
    return;
  }
  // Start dragging.
  if (!files.empty()) {
    base::MessageLoopCurrent::ScopedNestableTaskAllower allow;
    DragFileItems(files, icon->image(), ontents()->GetNativeView());
  } else {
    args->ThrowError("Must specify either 'file' or 'files' option");
  }
}
v8::Local<v8::Promise> Ws::CapturePage(gin_helper::Arguments* args) {