Bug 422826: crashes [@ nsVoidArray::Count] called from nsXPInstallManager::DownloadNext. r=dveditz

xpinstall/src/nsXPInstallManager.cpp

@@ -957,7 +957,6 @@ void nsXPInstallManager::Shutdown(PRInt32 status)
         // tell the dialog it can go away
         mDlg->OnStateChange(0, nsIXPIProgressDialog::DIALOG_CLOSE, 0 );
         mDlg = nsnull;
-        mDialogOpen = PR_FALSE;
     }
 
     if (mNeedsShutdown)