minor #16396 [3.0] [VarDumper] Tests fixed (TomasVotruba)
minor #16396 [3.0] [VarDumper] Tests fixed (TomasVotruba)

This PR was merged into the 3.0-dev branch.

Discussion
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[3.0] [VarDumper] Tests fixed

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Fixes broken test after merge.
Original 2.8 commit: https://github.com/symfony/symfony/commit/303f05baafc2267b72812c44670493433b7acb0f#diff-c45f29f2b7f10a6e3583f92526da067dR55

Fixes Travis failure of VarDumper: https://travis-ci.org/symfony/symfony/jobs/88382131#L2413

Commits
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358fb2d HtmlDumperTest fixed after merge

symfony/var-dumper,symfony/var-dumper