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Minimal test - lines (14, 50)

Code

namespace mozilla {
namespace widget {

HeadlessKeyBindings& HeadlessKeyBindings::GetInstance() {
  static UniquePtr sInstance;
  if (!sInstance) {
    sInstance.reset(new HeadlessKeyBindings());
    ClearOnShutdown(&sInstance);
  }
  return *sInstance;
}

nsresult HeadlessKeyBindings::AttachNativeKeyEvent(WidgetKeyboardEvent& aEvent) {
  NS_OBJC_BEGIN_TRY_BLOCK_RETURN;

  aEvent.mNativeKeyEvent = nsCocoaUtils::MakeNewCococaEventFromWidgetEvent(aEvent, 0, nil);

  return NS_OK;

  NS_OBJC_END_TRY_BLOCK_RETURN(NS_ERROR_FAILURE);
}

void HeadlessKeyBindings::GetEditCommands(nsIWidget::NativeKeyBindingsType aType,
                                          const WidgetKeyboardEvent& aEvent,
                                          const Maybe& aWritingMode,
                                          nsTArray& aCommands) {
  // Convert the widget keyboard into a cocoa event so it can be translated
  // into commands in the NativeKeyBindings.
  WidgetKeyboardEvent modifiedEvent(aEvent);
  modifiedEvent.mNativeKeyEvent = nsCocoaUtils::MakeNewCococaEventFromWidgetEvent(aEvent, 0, nil);

  NativeKeyBindings* keyBindings = NativeKeyBindings::GetInstance(aType);
  keyBindings->GetEditCommands(modifiedEvent, aWritingMode, aCommands);
}

}  // namespace widget
}  // namespace mozilla