return NS_ERROR_ILLEGAL_VALUE; }
  nsresult  GetCounterResetAt(PRUint32 aIndex, nsString& aCounter, PRInt32& aValue) const {    if (aIndex < mResetCount) {      aCounter = mResets[aIndex].mCounter;      aValue = mResets[aIndex].mValue;      return NS_OK;    }    return NS_ERROR_ILLEGAL_VALUE;  }