Auto merge of #20303 - kwonoj:refactor-winit, r=SimonSapin

refactor(window): reference winit where applicable

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This is nearly first changes to rustlang code and I suspect I could make possible mistakes lot, please point me anything if need to be updated. 🙏

This PR intends to update codebase per #20299 , mostly followed suggestion around https://github.com/servo/servo/issues/20299#issuecomment-373171416 to update reference to use `winit` where applicable. Confirmed local build / check works correctly for updated references.

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #20299 (github issue number if applicable).

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