return NS_OK;
mContentCount = aCount;
  nsresult  AllocateContents(PRUint32 aCount) {    if (aCount != mContentCount) {      DELETE_ARRAY_IF(mContents);      if (aCount) {        mContents = new nsStyleContentData[aCount];        if (! mContents) {          mContentCount = 0;          return NS_ERROR_OUT_OF_MEMORY;        }      }      mContentCount = aCount;    }    return NS_OK;  }