applicationNameForUserAgent is not work in ios

[dashixiong91]

• I have read the README
• I have already searched for the same problem
• I have read and done the setup for Android: IMPORTANT Note for Android and iOS and IMPORTANT Note for Android
• I have read and done the setup for iOS: IMPORTANT Note for Android and iOS and IMPORTANT Note for iOS
• I have ran the sample app and it does not work there

Environment

Technology	Version
Flutter version	1.20.2
Plugin version	master branch eaad17e
Android version	29
iOS version	13.1
Xcode version	11.1

Device information:

Description

Expected behavior:
set applicationNameForUserAgent will be get with eval navigator.userAgent
Current behavior:
navigator.userAgent is wkwebiew default userAgent

Steps to reproduce

InAppWebView(
      initialUrl: widget.initialUrl,
      initialOptions: InAppWebViewGroupOptions(
          crossPlatform: InAppWebViewOptions(
              debuggingEnabled: true,
              applicationNameForUserAgent:
                  'myApp'),
          ios: IOSInAppWebViewOptions(
              allowsBackForwardNavigationGestures:
                  widget.iosGesturesNavigation)),
      onWebViewCreated: (InAppWebViewController controller) {
        _webviewController = controller;
      });

[EastLee]

I have the same problem

[github-actions]

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