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Changes necessary to build servor with webrender 0.10.0
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- [ ] `./mach build -d` does not report any errors
- [ ] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).
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- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____
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Source-Repo: https://github.com/servo/servo
Source-Revision: e1eff691f8a1d8c9c7ab33344364f0419626b80e
2d65b999ff