mURL(aURL)
mURL(aKey.mURL), mHashValue(aKey.mHashValue)
  URLKey(nsIURI* aURL)    : nsHashKey(),      mURL(aURL)  {    MOZ_COUNT_CTOR(URLKey);    NS_ADDREF(mURL);    mHashValue = 0;    char* urlStr;    mURL->GetSpec(&urlStr);    if (urlStr) {      mHashValue = nsCRT::HashValue(urlStr);      nsCRT::free(urlStr);    }  }