Fixed missing clearHistory webview method implementation on Android, Fixed iOS crash when using CookieManager getCookies for an URL and the host URL is null

example/lib/in_app_webiew_example.screen.dart

@@ -123,7 +123,6 @@ class _InAppWebViewExampleScreenState extends State<InAppWebViewExampleScreen> {
                       return ShouldOverrideUrlLoadingAction.ALLOW;
                     },
                     onLoadStop: (InAppWebViewController controller, String url) async {
-                      print(CookieManager)
                       print("onLoadStop $url");
                       setState(() {
                         this.url = url;