[Bug]: Renderer spellcheck API does not work on Windows
- Dominant language
- C++
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Description
### Preflight Checklist
- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
- [X] I have searched the [issue tracker](https://www.github.com/electron/electron/issues) for a feature request that matches the one I want to file, without success.
### Electron Version
12.0.4
### What operating system are you using?
Windows
### Operating System Version
Windows 10 1909
### What arch are you using?
x64
### Last Known Working Electron version
None
### Expected Behavior
Expecting `require('electron').webFrame.isWordMisspelled('testt')` to return `true`.
### Actual Behavior
`require('electron').webFrame.isWordMisspelled('testt')` returns `false`.
### Testcase Gist URL
https://gist.github.com/lishid/53782e6e43f4bc431ac1fed3bff33c85
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Assessment
This issue has not been assessed yet.