mHistoryIndex = -1; mScrollPref = nsScrollPreference_kAuto; mScriptGlobal = nsnull; mScriptContext = nsnull; mURLListener = nsnull;
mThread = nsnull;
nsWebShell::nsWebShell(){  NS_INIT_REFCNT();  mHistoryIndex = -1;  mScrollPref = nsScrollPreference_kAuto;  mScriptGlobal = nsnull;  mScriptContext = nsnull;  mURLListener = nsnull;  InitFrameData();  mIsFrame = PR_FALSE;}