This PR was merged into the 4.2-dev branch.

Discussion
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[BrowserKit] Remove undefined variable $str

| Q             | A
| ------------- | ---
| Branch?       | master  <!-- see below -->
| Bug fix?      | yes
| New feature?  | no <!-- don't forget to update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | no   <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        | no <!-- required for new features -->

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Commits
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4b3fdd6 [BrowserKit] Remove undefined variable