<!---
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#### What versions are you running?

```console
$ go list -m github.com/chromedp/chromedp
<!--replace this line with the output-->
$ google-chrome --version
<!--replace this line with the output-->
$ go version
<!--replace this line with the output-->
```

#### What did you do? Include clear steps.

<!--Put your source code in fenced code block like this:-->

```go
put your source code here
```

#### What did you expect to see?


#### What did you see instead?
