This automates something that I find myself frequently commenting on in PRs.
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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
- [X] There are tests for these changes OR
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Source-Repo: https://github.com/servo/servo
Source-Revision: 3ec20d9cf517c67f4d280e8958cc58c4c2b4fbb2
This PR implements stub for NavigatorPlugins as outlined in #9991.
r? @jdm
Source-Repo: https://github.com/servo/servo
Source-Revision: 3b7e426d33e539303f46a0a153752683838186fc
