Example project not working on web

The example project is not working with flutter web, https://pub.dev/packages/flutter_webview_plugin#-readme-tab- this page states that this plugin supports flutter web. But loading an url does not seem to work.

Does this plugin really support web??

## System info

Issue occurs on: Web
Plugin version: 0.3.11
Flutter doctor output:

```
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel beta, 1.18.0-11.1.pre, on Linux, locale en_US.UTF-8)
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
[✗] Chrome - develop for the web (Cannot find Chrome executable at google-chrome)
! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.
[✓] Android Studio (version 4.0)
[✓] Android Studio (version 3.6)
[✓] Connected device (1 available)

! Doctor found issues in 1 category.

```

## Steps to Reproduce

1. Open example project from github
2. Run project for flutter-web
3. Click on any button
4. Nothing happens

Only clicking on "open widget web view" seems to do something. But only the `initialChild` is displayed.

## Logs

As far as the console logging works in the browser, this is the output:

```
dart.developer.postEvent Flutter.Navigation {"route":{"description":"MaterialPageRoute(/widget)","settings":{"name":"/widget"}}}
```

```
[✓] Flutter (Channel beta, 1.18.0-11.1.pre, on Linux, locale en_US.UTF-8)
• Flutter version 1.18.0-11.1.pre at /home/y/Documents/flutter/flutter
• Framework revision 2738a1148b (3 weeks ago), 2020-05-13 15:24:36 -0700
• Engine revision ef9215ceb2
• Dart version 2.9.0 (build 2.9.0-8.2.beta)

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
• Android SDK at /home/y/Android/Sdk
• Platform android-29, build-tools 29.0.3
• Java binary at: /snap/android-studio/90/android-studio/jre/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
• All Android licenses accepted.

[✗] Chrome - develop for the web (Cannot find Chrome executable at google-chrome)
! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.

[✓] Android Studio (version 4.0)
• Android Studio at /snap/android-studio/90/android-studio
• Flutter plugin version 46.0.2
• Dart plugin version 193.7361
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[✓] Android Studio (version 3.6)
• Android Studio at /snap/android-studio/88/android-studio
• Flutter plugin version 45.1.1
• Dart plugin version 192.8052
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)

[✓] Connected device (1 available)
• Web Server • web-server • web-javascript • Flutter Tools

! Doctor found issues in 1 category.

```