if (mPendingDatas.IsInitialized()) mPendingDatas.Enumerate(StartNonAlternates, this);
mPendingDatas.Enumerate(StartNonAlternates, this);
CSSLoaderImpl::SetPreferredSheet(const nsAString& aTitle){  mPreferredSheet = aTitle;  // start any pending alternates that aren't alternates anymore  if (mPendingDatas.IsInitialized())    mPendingDatas.Enumerate(StartNonAlternates, this);  return NS_OK;}