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~~This should help #11203~~ (no, it doesn't, but still worth it).
r? @jdm
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<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
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- [x] There are tests for these changes OR
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Source-Repo: https://github.com/servo/servo
Source-Revision: 5d98ee61bbdb76e179bc62c0366438e28abe79a9
