Usage with systray-rs

When I try to use web-view with the [systray-rs](https://github.com/qdot/systray-rs) library, I get an `Aborted (core dumped)` error. Do you know if that's something related to GTK not supporting two instances running at the same time?

Sample code:
```rust
let app = systray::Application::new()?;
loop {
match webview.step() {
Some(Ok(_)) => (),
Some(e) => e?,
None => return Ok(()),
}
}
```

If I remove the app assignment, the webview works fine. If I leave it (even if i'm not using the systray, just creating a new instance), the app crashes on webview.step(), with the core dump error.

Start by reproducing the provided Rust example with systray::Application::new() present and absent, then compare the behavior at webview.step(). Investigate whether initializing both libraries causes the GTK-related abort; done means identifying the interaction's cause and documenting a confirmed resolution or limitation.

Written by the indexing model from the issue text.